The Firefox Privacy Guide for Dummies!

Facebook created same day Pentagon kills similar project

See the revision history at the end ... if you make it that far :)

Before embarking on this journey into the bowels of Firefox, you may want to first read, Tor verses a VPN – Which is right for you?. If you choose to use the Tor Browser, you need not bother with this guide.


The following video will provide an overview of one aspect of what it is we're up against and why i wrote the Firefox configuration guides. I encourage everyone to view it, especially if you're one of the many people who aren't worried about surveillance because you 'have nothing to hide'.

Video: Prof Shoshana Zuboff on surveillance capitalism

You're aware that unethical companies such as Facebook, Instagram, Google, YouTube, advertisers, your ISP and even governments are spying on your activities and buying and selling the data they harvest, even if you may not be aware of how they're doing it. You're concerned about this invasion of your privacy, but what can you do abut it?

Welcome to the 'for dummies' edition of the Firefox Configuration Guide for Privacy Freaks and Performance Buffs!!!

The goal here is to provide a simple guide, to the extent that's possible, which will yield a privacy enhanced configuration of the Firefox web browser whilst breaking as few websites as possible. That said, be prepared to put a little bit more effort into your surfing activities, at least until the dust settles. The pay-off will be a much faster, cleaner, less annoying web that is less able to track and profile you. Note that i said "less", not "not".

WARNING: This guide is not intended for use with the Tor browser which is an already hardened version of Firefox. Configuring the Tor browser as outlined here may result in doom.

Catching the Fox

You want the standard release version of Mozilla Firefox; no Pale Moon, no Waterfox, etc., so if you don't have it, get it. If you run a Linux-based operating system, look in your package manager. Since it's privacy we're interested in, we're way too smart to be screwing around with Google Chrome or Microsoft Edge, though if you have an inferior alternative browser installed you could retain it as a backup.

Profiling the Fox

Start Firefox and enter about:profiles in the address bar -- you can call it the "location" bar or the "awesome" bar, i call it the address bar -- then press your 'Enter' key to load that address. This is where Firefox keeps a list of all your profiles. Profiles are where most of your settings, bookmarks and other junk gets stored.

Firefox Profile Manager
click me

You can have as many profiles as you want, but by default there will be just one named 'default'. We need another one, so click the 'Create a New Profile' button and name the new one 'privacy'. You can change the name later, but leave it be for now. Once you're done, exit Firefox.

Firefox will now annoy you (and let it keep annoying you for the duration of these next few months we'll be spending together) by asking which profile you want to load every damned time you start it and you should (almost) always choose your 'privacy' profile.

Pro Tip

There are many ' about: ' pages in Firefox, but not all are accessible from the various menus. To see some of those that aren't, enter about:about in the address bar, but be careful what you mess with in there!

Training the Fox

Firefox Profile Manager 2
click me

Restart Firefox and this time you should see the Choose User Profile window. Load your privacy profile but don't visit any web pages just yet, other than this one if you want. Firefox may load some default pages when is starts and that's something we'll fix later.

Profile Tip

If you don't want Firefox whining about which profile to load every time it starts, you can select your preferred profile and check the 'Don't ask at startup' option, but don't do that yet! Another way is to create a shortcut to load any profile you want.

For more about profiles, see Use the Profile Manager to create and remove Firefox profiles and Multiple Firefox profiles.

For more about ticklish penguins, go here.


If you're running Windows you will need to un-hide file extensions, and i suggest you keep them un-hidden.

With Firefox up and running, load about:preferences in the address bar or click the Hamburg icon on the toolbar, then 'Preferences'. Click the 'Search' menu item on the left and under where it says 'Search Bar', click 'Add search bar in toolbar'.

Next, go to the arkenfox/user.js GitHub repository. We need their prefsCleaner.bat (Windows) or (Linux) file and the updater.bat (Windows) or (Linux) file. Now before you mess up, hear me out: One by one, click on the file names, then click the 'Raw' button, then press Ctrl+S to save the files to your desktop. Failing to heed my advice can cause the file to get messed up which will surely result in Russia nuking us ... assuming you live in the U.S.. If you want to avoid those steps, here's the direct links to the files: (Linux), updater.bat (Windows), (Linux), prefsCleaner.bat (Windows). Now if you're one of those wiz kids, you may have deduced that we're going to need that user.js file too but we'll grab that another way.

Next, go to the page at, click the user-overrides.js file, then click the 'Raw' button and press Ctrl+S to save the file (here's the direct link to the raw file).

Next you'll need a decent code editor (no, not Notepad!) with syntax highlighting. If you're running Wintendo (that's one of my several derogatory names for Windows), PSPad is nice, simple and free. If you're running Linux you've surely got something installed already, so poke around.

What you need to do now is open that user-overrides.js file in your code editor and follow the directions Very Carefully. Every single little tiny thing you could ever possibly want to know about all the settings in that file is in there (except whatever i forgot to put in there).

Now that you've sifted through that convoluted mess (go you!), open Firefox's about:profiles page again. Note that user profiles and web cache are stored in separate folders, thus why you may see more than one directory path for each profile. In the row labeled 'Root Directory' under your 'privacy' profile, click the 'Open Directory' button and then kill Firefox.

In your file manager you may notice that the folder containing your 'privacy' profile actually has a longer name with a bunch of gobbledygook in front of 'profile'. Ignore that like you ignore your goofy neighbor with the tinfoil wallpaper. If you see a prefs.js file in there, you're probably in the right place. Next, grab those files from your desktop you pirated earlier and stick 'em in your 'privacy' profile folder where the prefs.js file is.

Now we need to run that updater script. How to do that depends on whether...'re running Linux

You will need to make those .sh files executable. You could try meditation or sacrificing a goat, but it'd probably be quicker to just right-click on each of them to open the file properties dialog window and click the 'Is executable' checkbox on the 'Permissions' tab (or similar). If your file browser doesn't have such an option, see How do I run .sh files?.

We need to run that script from a terminal, so open one and change the directory to your 'privacy' profile directory where the file is. In the example below you'll need to change 'gobbledygook' to match the correct name of your profile folder:

cd ~/.mozilla/firefox/gobbledygook.privacy/

Now run the script by preceding the file name with a dot and a slash:



...or Windows

To run that updater.bat script, navigate to your Firefox profile directory, hold down the Shift key and right-click in an empty space where the file is, then select "Open Command Window Here". Enter updater.bat and hit Enter. If you have trouble, see How to Run a BAT File on Windows: 13 Steps (with Pictures).


The updater script will spit out some introductory stuff and then prompt you to continue. If by chance everything in the universe is aligned just so, and you've followed the directions you didn't read, the script will download a fresh copy of the 'arkenfox' user.js file to your profile directory and append the contents of your user-overrides.js to it just like it says on the tin.

Pestering the Fox

The 'arkenfox' user.js is updated fairly frequently and so you'll need to check for updates regularly. There's two ways you can check for updates if you're running Linux and one if you're running Windows, however there's only one (easy) way to actually update the user.js and that's by using the 'arkenfox' updater script.

user.js-notify script message (Linux)If you're using a Linux-based OS you can use my script to be automatically notified via a desktop notification when:

  • the 'arkenfox' user.js is updated
  • my user-overrides.js is updated
  • this guide is updated

The idea here is to add the script to your startup programs so it runs each time you log-on to your desktop. Instructions for implementing the script are contained within the script. Open the file with a code/text editor to read the instructions and edit a few options.

To check for a new user.js if you're running Windows, or to actually update the file, kill Firefox and run the 'arkenfox' updater script. If you're running Windows, or if you're running Linux and don't wish to use my script, you should run the updater script every week or so in order to check for a new version. You always want the user.js version that corresponds to the major version of Firefox, so if the updater script says Available online: * version 80-alpha and you're running Firefox version 79.0.1, you'll want to cancel the update because 80 doesn't equal 79, unless you're "woke" in which case it all bets are off.

Each time you run the updater script, be sure to follow it up by running the prefsCleaner script using the same method as described earlier for your operating system. The prefsCleaner script will reset any depreciated, removed, or inactive preferences and it's important that you do this.

updater script Pro Tip

If you use Linux you can run the script with the -c switch ( ./ -c ) which will create a 'diff' file that will list all the differences between the old user.js and the newer one.

To see all the options for running the updater script for both Linux and Windows, see the Updater Scripts article on the 'arkenfox' wiki.

Fattening the Fox

Now we're going to go to the Firefox Add-ons website, AMO (Addons.Mozilla.Org). Start Firefox and select your 'privacy' profile, then come back here.

Why does he say 'WE' and 'WE'RE' when 'I' am the one doing all the f'n work?!

Plausible deniability. If i screw something up that causes your computer to explode, it's your fault.


One at a time, middle click each of the links below to open their pages in a new tab, then Read What It Says for each add-on and install it. If by chance a particular add-on is not available for some reason, let me know and don't install something you think is equivalent because it probably isn't.

Once you have all those installed, find the 'Customize' option in one of the Firefox menus or by right-clicking on an empty space on a toolbar somewhere. With the exception of uBlock Origin, you can drag the toolbar icons for the other add-ons, for those that have them, to the Overflow Menu since you will rarely be interacting with them.

A note regarding add-ons...

More add-ons = more bad (generally speaking).

It's pretty important, and especially so if you're new to the game, to NOT install add-ons willy-nilly. The more you install, the more likely things will break and that your privacy will be compromised, so DON'T GO OVERBOARD with add-ons.

The selection of recommended add-ons in this guide accounts for not only how your privacy and browsing experience is affected, but also how they interact with each other as well as with a Firefox that has been extensively modified by the 'arkenfox' user.js. If you install certain additional add-ons that you *think* will guard your privacy, you could very well wind up with an opposite result. In particular, stay away from any User-Agent spoofing add-ons.

Firefox has built-in mechanisms which help to prevent browser fingerprinting and safeguard your privacy. Alone they are not enough, which is why you fell into this pit of despair, but they do cover some very important ground.

For more on the subject and what to look for when considering add-ons, see Firefox Extensions – My Picks.


We need to configure some of the add-ons we installed, but first a word to the wise: Unless you know what you're doing, i strongly suggest you configure these add-ons as outlined here, else Russia.

To configure your add-ons, load about:addons in the address bar or find the 'Add-ons' menu item in one of the Firefox menus.

Clear URLs: In the preferences, enable the following options where an [X] indicates the option is enabled:

[_] Allow domain blocking (if you're not using any of the major ad filtering lists in uBlock, then enable this).
[X] Skip URLs on local hosts
[X] Prevent tracking injection over history API
[X] Block hyperlink auditing
[X] Filters ETag headers from requests

The rest of the options are just that; optional :)


[1] Enabling this will enhance privacy, however this option will break some websites.

Cookie AutoDelete: On the 'Settings' page, click the 'CAD Settings' tab and enable the following in the 'Automatic Cleaning Options' section:

[X] Enable Automatic Cleaning
[X] Enable Cleanup for Discarded/Unloaded Tabs
[X] Enable Cleanup on Domain Change
[X] Enable Greylist Cleanup on Browser Restart
[_] (optional) Clean Cookies from Open Tabs on Startup
[X] Clean All Expired Cookies

In the 'Other Browsing Data Cleanup Options' section, enable all options.

The rest of the settings are optional.

While Cookie AutoDelete (CAD) may seem a bit complex at first, it's really very easy to use. Given the combination of the 'arkenfox' user.js, my user-overrides.js and the suggested CAD settings, you'll pretty much be able to ignore CAD and get on with your life. The exception will be when you need (more so than 'want') to save some sort of data for some website, like if you want to log-on automatically even after you restart Firefox, or you want to save your settings for a search engine website. In these cases you will click the CAD toolbar icon and either greylist or whitelist the domain or the domain and all its subdomains. Read the CAD documentation and FAQs to learn how to do this.

uBlock Origin: This is a huge biggie! I know, supposed to be the 'for dummies' guide and all, but you really gotta learn how to use uBlock Origin (uBO). The good news is that it's got a 'dummy' mode and it's enabled by default!

To set up uBO, read my uBlock Origin Suggested Settings guide.

Of particular importance, DO NOT select the 'I am an advanced user' option! Don't look at it. Don't think about it. Don't think about looking at it ... at least not until you read all that 'required reading' stuff and understand fully what uBO is, does, how to configure it, and how easy it is to break the entire interwebs if you screw up.

Now it's really important that you read this and this and this, but only up to the 'Medium mode' part for the last one. Once you complete that you'll be a Semi-Certified uBlock Origin Web Filtering Engineer Apprentice.

Break time...

Training the Foxineer

With that all done and Firefox running, close all tabs and click the Hamburger button again to open the Preferences window, then click the Privacy & Security menu item, or load about:preferences#privacy in the address bar. Scroll down to the Cookies and Site Data section and click the Manage Data button. In the Manage Cookies and Site Data window that opens, click Remove All. This will remove (almost) all of the stored data that Firefox has accumulated so far. We're just doing this to nuke anything that was stored before we installed our privacy add-ons, plus so that you know how to nuke Firefox storage.

A question i get allot...

Q: If i mess up my Firefox profile, maybe by accidentally enabling JavaScript when for a website where i shouldn't have, should i reinstall Firefox?

A: No. The only thing you would achieve is to reinstall the same identical files that make up the core of a Firefox installation while leaving your profile, where most web related data is stored, intact, so there's no point. What you can do in a worst case scenario is save what you need from your profile (bookmarks, passwords, etc.) and then nuke the entire profile after which Firefox will generate a new one. This is a rather extreme and probably unnecessary action to take however when instead you can simply nuke all of Firefox's storage.


If you've used Firefox before there's going to be some changes, one of them being that you'll be searching from the search bar (or a web page that isn't Google hopefully) instead of the address bar. The reason for this is a little creepy, suffice to say it's a privacy/security thing. Live search suggestions will be disabled because it's also a creepy thing, though the search bar will still suggest stuff from your history, bookmarks and previous searches.

Now for the really important stuff...

Remember the part at the beginning when you started reading this last week? You know, where i said we'd be "breaking as few websites as possible"? Kek! Since we disabled JavaScript globally with uBO, every other website you visit is going to be busted, and for good reason too.

There's a few things you need to know about JavaScript: 1), it's awesome-ish, 2) it's a privacy nIGhTMarE, 3) almost every website on Planet Earth uses it (even this one).

JavaScript (JS) can be used to do all kinds of cool (and creepy) things like make web pages interactive, make dull things look un-dull, animate stuff, etc.. It's used a lot for making navigation menus work and displaying images, as well as for annoying the bejeezes out of you with ads and pop-ups and it's almost always necessary when shopping. Of primary importance however is the fact that JS is also leveraged heavily for tracking and profiling you, your web browser, your computer, family history, bathroom habits and the masturbation techniques of your family pet, and thus it's a privacy (and, to some extent, security) nightmare (if you want to beat yourself up even more, read Stop pushing JavaScript! by a guy who knows what he's talking about).

Now do you see why we disabled JS globally for the entire web? Thing is, it's very easy to enable again For Those Specific Websites Where You Really Need It to be enabled. "Need", i said. Not "like" or "want", but "need".

Start Firefox and load up your privacy profile, then middle-click this link to open it in a new tab and click some of the colors on the color swatch and…… well that was boring, but WAIT! THERE'S MORE! Now click the uBlock Origin button on your toolbar and in the lower right corner there’s an icon that looks like a </> , except it has a red ‘X’ through it. That icon is secret code for [CENSORED]. Click it to remove the ‘X’ and you will have enabled JavaScript for that particular domain after which you’ll see a new button appear out of thin air that has circlely arrows on it. Clicking that button (or pressing F5) will refresh the page at and this time your browser will allow JS to run for the entire domain. That color swatch page will now look very different and this time when you click the colors, awesome things will appear that will surely dazzle you for hours on end (like that damned triangle puzzle-peg thingy in every Cracker Barrel).

The point of that intensely interesting exercise was to demonstrate the power of JavaScript by showing you how different it can make a website look and work, as well as how necessary it is in some, but not all cases. For example, if you're reading this nail-biting novel with your Firefox privacy profile loaded and JS disabled, it wouldn't make much of a difference because the place looks and works pretty much the same whether JS is enabled or not, thus you should never enable it where it isn't needed. Kapish?

Now you're going to take the JavaScript Oath with me. DON'T LAUGH, this is important shit! OK, repeat after me:


Importing stuff from an old profile

If you're not a first-time Firefox user and you have important bookmarks or other stuff you want to import to your new privacy profile, make a backup copy of your profile and then go ahead and read this.

What to do when the Fox bites

It's inevitable that you're going to have trouble with some websites. Keep calm. Breeeeath! You've already gotten a taste of how a website can be rendered useless with JavaScript disabled and although i let you enable it for the site given in the example earlier, i only did so because it's a trustworthy place. The next website you visit may not be. You're here aren't you?

To make a broken website function again, you'll need to use uBlock Origin to enable the functionality you need for those websites you trust. If you cannot get a website to cooperate by making site specific changes in uBlock, you can always spin-up a fresh, empty profile, but understand that you will be at the mercy of a completely default Firefox configuration with all of our extra privacy protections removed. For websites you don't trust, why are you visiting them? Porn? Warez? If you value your privacy and digital integrity, forget that stuff. Seriously.

Another 'gotchya' that will likely creep up at some point is a website not saving settings that you wanted to save, such as your log-on credentials or search engine settings. To save this data you will need to edit the permissions for the domain and there's two easy ways to access them; you can right click within the page to open a context menu, then click the "View Page Info" menu item, or you can click the padlock icon in the address bar, then the right-facing arrow, then "More information". In the window that opens, click the "Permissions" icon and scroll down until you see the "Set Cookies" item. Finally, deselect the "Use Default" preference and select the "Allow" preference to keep your settings for the website after Firefox is closed and restarted.

I would NOT suggest allowing cookies for any privacy-hating social media or mainstream search websites such as Google, Yahoo, Bing, Facebook, Instagram, Twitter, etc.. If you want to learn more about alternative search engines, read Alternative Search Engines That Respect Your Privacy.

The Fox hole

Even with everything we've done, you're still vulnerable to being tracked and profiled, however you're in a better position now then when you started out, except for one little problem: Your Internet Service Provider!

At the very least your ISP can see what websites you visit, when you're surfing the web and when you're not. They may even inject ads, malware or other garbage in your data stream. The solution: Hijack your neighbors unprotected WiFi and... Kidding! Listen, you and i have gotten to know each other throughout this long and difficult ordeal. We're kinda like buddies now. Kinda. And i can already tell you're ethics are of a higher caliber than mine that!

One solution to the problem is a Virtual Private Network (VPN). Ever wanted to be in 30 places at once?

A VPN works by encrypting the traffic between you and another computer run by the VPN service provider which we'll call an 'exit node'. That exit node could be anywhere in the world. From the exit node your traffic flows as normal to whatever website you want to visit and the website then sends the kitty video you clicked on back to the exit node thinking IT is YOU, but alas, IT AIN'T! YOU FOOLS! The kitty video then secretly makes its way back to you through this secret tunnel which was secretly established between you and the exit node. So far as the website is concerned, it doesn't know where the hell you really are and so far as your ISP is concerned, all it sees is gobbledygook that looks like Braille to a quadriplegic tuna. Ever annoyed by that galactically stupid "Sorry, this video is not available in your country" crap? Pfff.

There are truck loads of different VPN service providers and it seems the vast majority do not take customer privacy seriously, however i think both NordVPN and AirVPN are good companies that offer a good service at a good price. I've used both and i like both. Both have servers (think 'exit nodes') all around the globe and neither restrict any protocols (think 'BitTorrent'). Both offer client applications that you can install to make using their service stupid simple. If you'd prefer to pick a VPN provider yourself however, i recommend you visit That One Privacy Site and browse the fantastic spreadsheets the dude puts together. Another good resource is TorrentFreak's annual VPN reviews. Here's the one for 2018. I would strongly advise against any VPN add-on on the Mozilla add-ons site for a few reasons, one of them being that they very likely suck from a privacy perspective and another being that it's only your browser that will benefit and not the rest of your OS and software. Lastly, NEVER trust any "free" VPN provider. Ever.

The downside?

  • Though VPN services are cheap, it's still an additional expense
  • VPN exit node IP addresses can get blacklisted which could cause problems sending mail and accessing certain websites and services, however in my experience this hasn't been a huge issue and, even if is is, it's usually just a couple of mouse clicks to switch exit nodes
  • Latency (the time between the mother-in-law walking in front of your car and your realization that you need to slam on the breaks) and bandwidth (how many tweets per second you can send notifying your friends of the "accident") will be affected, but in my experience the difference isn't huge

In short, i think the pluses of using a VPN outweigh the minuses. That said, you can never trust any VPN service 100%, but any reputable one will help to protect your privacy and should certainly prevent your ISP from spying on you. If it's the NSA you're worried about, well, that's another story, but i'm not at all convinced there's any way to thwart that threat.


So now you're all smitten thinking you're invincible and ready to hack NASA to see if aliens really built Taco Bell's on the back of the moon (they did, sorta, pretty sure). You're not, but you've taken one, small step for man, and..... Truth is, there are far more vectors for attack than you and i and the so-called "experts" may ever know about, so don't get all uppity. Perfect privacy on the web, as in real life, is a pipe dream and it wasn't the goal here anyway. We've covered some important bases that will help prevent nasty corporations and your ISP from spying on you, but not all of them. Remember that when you're creating fake profiles on Facebook to stalk your ex.

After you've taken plenty of time to get comfortable with your new Firefox configuration, i suggest reading everything in the uBlock Origin wiki and learning how to use it in its advanced mode. And after that, it's the Firefox Configuration Guide for Privacy Freaks and Performance Buffs.

Be safe. Be ethical. And if you need help (after you've tried to help yourself), leave a comment or check the FAQ: Firefox Hardening page.

IMPORTANT: If you incorporate suggestions made in this guide, please subscribe near the bottom of this page so you can be informed of updates. This article is updated fairly often and that's the best way to stay informed.

Further resources


Click to expand...


  • minor edits, typos



  • added more info about the script


  • reversed the order of this change log so newest changes are at the top


  • well, that didn't last long - after more testing i reinstated Cookie AutoDelete because i think it's easier to use it than it is to be adding cookie exceptions all the time, plus no CAD breaks session restore with the 'arkenfox' user.js and there are other quibbles as well
  • removed Privacy-Oriented Origin Policy - given its limited usefulness, non-noob friendly filter syntax and potential to break a site on rare occasions, i decided it wasn't needed
  • minor edits


  • removed all Cookie AutoDelete add-on info - given the intended audience for this guide, as well as first-party isolation and resist fingerprinting being enabled in the 'arkenfox' user.js, it isn't needed
  • removed all LocalCDN add-on info - given the intended audience for this guide, as well as first-party isolation and resist fingerprinting being enabled in the 'arkenfox' user.js, it isn't needed
  • added instructions for keeping storage items (log-on credentials, settings) for websites
  • minor edits


  • split off part of the 'Fattening the Fox' section into a new section, 'Pestering the Fox', which includes new info about how to automatically be notified when a new version of the 'arkenfox' user.js is available (Linux only)


  • replaced Site Bleacher with Cookie AutoDelete (CAD) - search for "Cookie AutoDelete" to see the edited content
  • minor edits


  • added more info about the 'arkenfox' updater script regarding keeping the user.js version in sync with the major Firefox version


  • minor edit


  • removed the 'Don't touch my tabs!' add-on (obsolete since Firefox v79)


  • replaced Decentraleyes with LocalCDN


  • added the video, Prof Shoshana Zuboff on surveillance capitalism


  • updated the URL for the uBlock Origin Suggested Settings Guide


  • removed ETag Stoppa since ClearURLs covers eTag storage filtering
  • added settings details for CLearURLs


  • added more info about circumventing website logon problems due to Site Bleacher add-on
  • minor edits


  • removed 'Font Fingerprint Defender' add-on - i got word that the extensions may be problematic


  • removed 'First Party Isolation' add-on
  • added 'Font Fingerprint Defender' add-on
  • minor edits


  • added ETag Stoppa to extensions section
  • added link to 'FAQ: Firefox Hardening' page
  • minor edits throughout


  • minor edit


  • added a more extensive warning about installing add-ons in addition to those recommended herein


  • misc. edits and clarifications, nothing too drastic


  • stuck the uBlock config stuff on its own page


  • rewrote several bits of the guide in an attempt to clarify things and make it a bit shorter
  • edited some content to bring it up to date with the newest version of Firefox
  • adjusted settings for uBO


  • added a warning about using this guide with Tor
  • added a resources section


  • added instructions for enabling the search bar in the navigation bar since setting the preference alone in user.js doesn't work for some reason
  • minor edits


  • added HTTPZ
  • added Site Bleacher and associated information
  • removed temporary profile info
  • lots of minor edits


  • minor edit


  • added better description and screen-caps for how to download user-overrides.js
  • minor edit


  • clarified info regarding the downloading of the configuration files


  • clarified a lot of stuff that may not have been clarified clearly enough
  • eliminated the 'relaxed_user-overrides.js' file - the user-overrides.js is now used for both the advanced and dummy guides
  • updated the user-overrides.js file
  • lots of minor edits, corrections


  • polishing, clarifications


  • added more info about using the user.js updater and prefsCleaner scrips
  • many small changes and polishing


  • first (pre) release


Note that both reader and my comments, while they may have been accurate at the time, might be inaccurate today. This is a highly dynamic environment so please verify the accuracy of comment content should you wish to utilize it. Failing that, ask me and i'll give it a crack.

87 thoughts on “The Firefox Privacy Guide for Dummies!”

  1. I use FF esr (now it is 78.3.1).
    Which version of user.js should i use?
    When updating user.js i run command “updater.bat -esr”. But user.js now has а version “82-alpha”.

    1. you should use the one that corresponds to your version of Firefox – so for Firefox 81.x for example, you want version 81 of the user.js

      that said, you can (and i have) used newer versions of user.js

      1. It turns out that the correct way for version 78.3.1esr is to work with the 78 user.js and not update it? I mean do not run “updater.bat -esr” because it will automatically update user.js to the latest version.

        1. yes – it’s always been my understanding that the user.js version is intended to be used with the same major version of Firefox

          because the user.js is constantly evolving beyond just implementing changes brought with new versions of Firefox, i might suggest re-evaluating whether you want to run an ESR

          as for stability, the release version of Firefox is usually very stable – there may be some (usually minor) bugs, but these get patched quickly

  2. You make a point that searching from the url bar is not recommended but what about right clicking a word and select, for example, ‘ Search for “word” ‘? Is it still bad for privacy?

  3. I have to re-do all the process in my Fox again, so two questions:
    1. Is there a way to save all that privacy-hardening tweaks and data and load it in the default firefox?
    2. how do I check that all this is working well, that is, that it’s doing its job?

      1. I’ve just reinstalled my entire operating system (Pop_OS! and soon moving to Manjaro). Yeah I’m not very tech-savvy, I’m barely taking my first steps on GNU/Linux and tinkering on it.

        1. i use and like Manjaro

          regarding your FF profile, just restore your old profile after installing the OS

          i would install FF and run it to create the profile directory, exit, then delete everything in the new profile folder and copy everything from the old profile to the new – i think that should work and nothing lost if it doesn’t

  4. After customizing Firefox preferences with user.js and user-overrides.js I find that if I change a preference either through the UI or in about:config that if I close Firefox and open it again the changes that I made are lost and they are reverted back to what was set in user.js and user-overrides.js. Are changes that you make like that not supposed to be kept?

    1. changes made within the FF UI/about:config are written to prefs.js – user-overrides is copied to user.js with the bat/sh script – when FF starts, it reads user.js and overrides any duplicate prefs in prefs.js, so any changes you make to prefs in the UI which are duplicated in user.js (which includes user-overrides) will be overwritten/lost on re-start

      since i strongly advise against making changes to the ‘arkenfox’ user.js, what you can do instead is copy the pref(s) you want to change to the overrides file and change them there

      if you’re having a problem, let me know

      1. I was just thinking after I started using the Aris-t2 CustomCSSForFx if I quicly wanted to see my interface the way it looks without the custom CSS I could just set the toolkit.legacyUserProfileCustomizations.stylesheets preference to false and restart the browser. Instead of commenting out the import of the library in the userChrome.css and userChrome.css files. Which I think is the same thing, but changing the preference is easier/quicker. However that does not work as per the above.

        1. It just slipped my mind that Firefox reads the user.js file each time it starts.

          I have to say the UI looks fantastic using the CustomCSSForFx library. It is such a cool experience to remember what the browser UI can look like, and should look like, if you don’t have really !smart people working on it.

          On that, would you perhaps know or should I rather be asking the CustomCSSForFx developer. On the default interface if I have a tab in a container, I now use containers exclusively for separating work streams (I really like that I can (un)hide containers from the UI) and different logins to the same services, and the tab is coloured Red all the tabs that belong to that container group will have a Red line underneath the tab title. But when using CustomCSSForFx the Red line is only displayed on the tab when the tab is active. I am not sure if this behaviour can be changed in my userChrome.css. If it can would you perhaps know what to import?

  5. My FF has now been hardened according to this dummies guide for 3 days. During these days I have used my browser extensively and I salute you. Your advice is really awesome and I enjoy learning from you. Your articles are great and easy to understand.

    So far things have been running really smooth. I have had ‘problems’ here and there but it has mainly been down to Java Script. I believe I can increase my control over this more with uMatrix, then you don’t necessarily have to enable Java Script as a whole. I still need to look into that.

    The one thing that I would like your input on is why is takes so long for a YouTube video to ‘load’ on a browser that has been hardened and that has 540 tabs open. By ‘load’ I mean if I paste the YouTube video URL into the address bar and I start timing when I hit enter until the window becomes responsive again. I am not here to bash you that you have slowed my browser, I am just trying to understand how the hardening is affecting load times of a YouTube video in a browser with lots of tabs.

    To put what I say into perspective, I created 2 additional profiles. The one profile I left default and into the second profile I copied the contents of my browser profile (minus parent.lock and times.json). After opening the second browser I closed all but the tab I was on, so now both the new default and hardened profile browsers only had a single tab and I had my hardened profile with 540 tabs.

    I Then copied the URL of the YT video into the clipboard and pasted it into a new tab in each browser (not all at the same time) and started timing as soon as I hit enter.

    privacy (540 tabs) : 25
    privacy (1 tab) : 9
    default (1 tab) : 5

    I closed my browser and started it fresh before opening the 2 additional profiles and performing the test. So none of the other tabs loaded.

    I am interested in why it takes 14 seconds longer for the video to load on a hardened profile with 540 tabs. Why would the additional tabs influence load time?

    1. you’ll get more control over resources with uMatrix, but then you’ll want to disable advanced mode for uBlock (if you have it enabled) and use it more or less as an ad blocker – in this mode uBO becomes pretty much transparent, requiring no fiddling from you

      ThemTube (aka “You”Tube … censorship, right?) is owned by Google who markets Google Chrome – as such, YT is purposely designed to load slower with Firefox because they are using an obsolete API (Polymer) – this is one reason why YT vids load slower on FF, however i wasn’t even aware that a privacy profile would also slow it down – uBO has a logger that you might use to troubleshoot, or you can use the built-in FF developer tools

      to speed-up loading you can disable Polymer by adding disable_polymer=true to YT URLs – you can automate that with an extension like Redirector

      1. You are the dude!

        I knew about the Polymers, I read about them in your “Firefox Tweaks and Fixes and Styles and Things” article. This is what I am doing next. But I quickly skipped ahead and disabled Polymers. What a difference! There isn’t even a difference in load time now comparing the 540 and 1 tab hardened profiles. They both come in at 7. It looks so much better as well.

  6. After following your dummy guide through from start to finish on a default profile I have something odd. When I open a new tab to search something there is lets call it greyed out text that says “Search with DuckDuckGo or enter address”, which is exactly what I expected to see. But when I type something in instead of searching for my “word” it immediately changes it to a URL “http://test/”. Looking at the preference settings in about:preferences it looks good. If I compare it with a working profile the settings are identical. Is this a setting in either the ghack user.js or your user-overrides.js preferences?

    Everything else seems to be working exactly as it should, again thank you very much for your very comprehensive guides. They are awesome.

      1. I am not sure I understand your question properly.

        I open a new tab, at which time there is no address or anything in the address bar. What is in the address bar is a magnifying glass on the left and next to that it says “Search with DuckDuckGo or enter address”. If I proceed and type “test” in to search DDG for “test” and I hit enter it doesn’t perform a search, instead it goes to http://test/.

        1. are you using the default new tab page provided by Firefox or by an add-on? if the former, i don’t know the answer – if the latter, what add-on are you using?

          1. No I do not use a new tab add-on. Ok I guess I will try with another new profile and if that gives the same rresult well then I can only try on a completely different installation, either on the same machine or in a VM. I switched my search engine to Google to test but that does not work either. I can choose the option in about:preferences “Add search bar in toolbar” then it searches correct, but I do not like it like that.

            1. I created a new profile in Firefox (I also reinstalled Firefox to check everything) and when I start typing a word into the address bar, like “test” it is searched on DDG.

              I then copied updater.bat, prefsCleaner.bat, user-overrides.js to the new profile directory and executed updater.bat. After it completed successfully I open Firefox and when I type “test” into the address bar it wants to go to http://test/ instead of searching test on DDG. So this problem must be something that is set in either ghack’s user.js or user-overrides.js.

              This is with Firefox 76.0.1.

              1. I must still check the history of ghack’s user.ja but I found the ‘problem’,

                /* 0801: disable location bar using search
                * Don’t leak URL typos to a search engine, give an error message instead.
                * Examples: “secretplace,com”, “secretplace/com”, “secretplace com”, “secret”
                * [NOTE] Search buttons in the dropdown work, but hitting ‘enter’ in the location bar will fail
                * [TIP] You can add keywords to search engines in options (e.g. ‘d’ for DuckDuckGo) and
                * the dropdown will now auto-select it and you can then hit ‘enter’ and it will work
                * [SETUP-CHROME] If you don’t, or rarely, type URLs, or you use a default search
                * engine that respects privacy, then you probably don’t need this ***/
                user_pref(“keyword.enabled”, false);

                If you set that to true you can once again search directly from the address bar.

                1. You also have a preference set in user-overrides.js, line 287,

                  user_pref(“browser.urlbar.oneOffSearches”, false); // [SET] whether to allow searching from the address bar

                  The description of the preference is wrong however. That preference does not control whether searching from the address bar is allowed or not. What this preference allows you to do, is click on an icon of another installed search engine to use it for that search. But only that search. Your default search engine is not changed.


                  The correct preference to use is the one from above, “user_pref(“keyword.enabled”, false);”. Line 461 of ghack’s user.js. This preference controls whether searching from the address bar is allowed or not.

                  1. actually both prefs control searching from the address bar – browser.urlbar.oneOffSearches will display the search icons and allow searching from the address bar even with keyword.enabled disabled

                    but your right about my description – it was not entirely accurate – i changed it to ‘ [SET] whether to display search engine icons when searching from the address bar

                    thanks for pointing that out

                    sorry for the trouble- had i known you were using the address bar i would have mentioned the keyword.enabled pref

                  2. actually, scratch that – i just moved browser.urlbar.oneOffSearches to the depreciated section of user-overrides – there’s no reason i know of to disallow searching from the address bar AS LONG AS keyword.enabled is disabled – might be until FF v77 hits that i’ll upload a new user-overrides

                2. ah, i neglected to ask whether you were searching from the search bar or address bar – address bar searching is disabled in ‘arkenfox’ user.js for privacy reasons – at one point Moz partnered with what appears to be a shady company (Cliqz or something like that) and everything people typed in the address bar was being sent to them – i believe there are still privacy concerns with that, thus why it’s still disabled

  7. Great article, thank you for sharing your knowledge.

    Ok so one has to use Firefox, I assume this is because of the highly customized user.js file and your personal user-overrides.js customization. Because all of the extensions listed in your guide can be installed in Waterfox as well.

    Would one be significantly better off using Firefox with the customized user.js with all of the extensions mentioned installed, compared to using Waterfox as is with the extensions mentioned installed in Waterfox? If so, why? Just because of the customized user.js?

    1. the recommendation to use only Firefox is, in part, due to the ‘arkenfox’ user.js which is specifically tailored to the current version of Mozilla Firefox – i have no idea what issues may arise if it were used in conjunction with any other version/fork of Firefox

      if you haven’t already discovered through articles here, i am not a huge fan of Mozilla, however it is my opinion that Mozilla’s Firefox is the best suited, capable, mainstream browser for privacy hardening

      i totally get the desire to switch to a fork that may be more privacy-centric out of the box, however in my, and others’ opinions, there is little or nothing that can be achieved with any of them that cannot be achieved with vanilla Firefox

      there are other reasons as well to use only Mozilla’s version (security patches being one of them)

      i would love to see more competition in the privacy enhanced browser market, but it’s just not there at the moment i don’t think (this includes WF, Brave, etc.)

      1. Funny, uBlock prevents me from leaving a reply I had to disable it for this site to leave my reply.

        In saying that ‘arkenfox’ user.js file is tailored specifically to the current release of Firefox, can you please advise on Firefox upgrade strategies?

        Also, I have installed most of the addons and followed your recommended configurations for each. I am still to implement ‘arkenfox’ user.js file and run the scripts, I am currently doing a config in Waterfox, the reason I have not implemented user.js or run the scripts. However after installing uBlock YouTube no longer works, is that because of JavaScript? I am running YouTube inside a container to separate it out from any other website data, cookies, etc. Would it still be unwise to allow JavaScript? I know Google is the enemy and all but I do a lot of research on YouTube as well.

        1. i would suggest you read thoroughly the uBlock wiki or you’re going to have a lot of problems :)

          far as upgrading Firefox, just stay with the current release of both Firefox and the ‘arkenfox’ user.js – i usually check for a user.js update when Firefox updates

          you say you’re running YouTube in a container – how so? if you’re using the Temporary Containers add-on, or any other container add-on, or the built-in Firefox containers, they aren’t necessary as long as you have FPI (first party isolation) enabled in Firefox (privacy.firstparty.isolate) which does essentially what containers do, less the hassle (it works completely transparently)

          for YouTube, yes, you need to allow scripts to run – allowing scripts for most any mainstream site often presents a risk to privacy, but if you want to use them you have no choice – scripts must be allowed for many sites to work

          you can however use something like Privacy Redirect which can access YouTube videos via a sort of proxy – it also covers Twitter and Instagram

          and of course for searching with Google, you can use DuckDuckGo, Startpage, etc.

          seriously though, make SURE to read the uBO wiki and learn how to use it well to avoid many headaches

          i’m guessing you’re new to all this, so my next piece of advice is to take it slowly – don’t go overboard and try to lock down every little thing at once

          also, you can use a valid mail address if you want to be notified of comment replies – i do not send any unsolicited mail here

          1. Yes I use Temporary Containers for opening new links or just a new tab, but I also use Multi-Account Containers,, which gives you more control over Containers. I do it because Containers separate/isolate things. Cookies, Logins, etc, created in Container A cannot be seen/accessed in Container B. Therefor if you do enable Java Script for example on your YouTube Container, or even a temporary container you opened to check out a new link, then that Java Script, or any other data/metric that may be collected and sent back, can only go as far as the container. Isn’t that more that what FPI does?

            I do search with DuckDuckGo (I have read and am busy digesting your search engine cautions and recommendations). I have a question regarding this if it is ok. If you do a search with DDG then it takes a while to get redirected to the non-Java Script,, webpage. I have tried to edit the default search page by editing “search.json.mozlz4” with the mozlz4-edit addon, changing

            “__searchForm”: “{searchTerms}”


            “__searchForm”: “{searchTerms}”


            “template”: “”

            But that does not seem to do the trick. I thought I would be able to change it here to make the DDG/html page my default search option. Can it not be done or am I missing soemthing?

            I am new to hardening Firefox yes, but not new to IT or things technical. I just headed your advice and decided to start with the “for dummies” guide to first familiarize myself with the new information and tools.

            1. containers offer little more than FPI – FPI isolates all the things you mentioned (cookies, JS, logins) as well as indexedDB storage, DOM storage, cache, shared workers and more, so i personally see containers as an added hassle rather than a benefit since FPI works transparently, however containers will allow you to log on to multiple accounts simultaneously – you can read more here

              there are (or were) 1 or 2 things that containers handled that FPI doesn’t/didn’t and i don’t recall what that was or if that’s still true

              i’ll also be dropping (hopefully) Canvas Blocker from the list in the advanced guide shortly since the built-in canvas protections in Firefox cover almost all of the relevant stuff that CB does (i stopped using it myself)

              i’ll get back to you on implementing the non-JS version of DDG

            2. actually, rather than posting the code to add DDG no-JS version to search.json.mozlz4, all you have to do is add it from the search bar – then you can edit search.json.mozlz4 with the mozlz4-edit add-on if want

              i think the mistake you made is the template URL “” i believe you missed the trailing slash: “”

  8. Is it possilbe to have a master firefox profile on one computer, update adn manage that on one computer only and then copy and paste the profile on several other computers rather than running all the scipts etc on each computer? I don’t really want to use the firefix sync accounts method and would rather just do my own copy and paste. Wondered whether there were any problems build into the firefox file system that would stop you copying one profile onto another?

    1. i’m 99% sure it’s possible to copy a profile to another computer, however i don’t know whether they can be synchronized regarding things like add-on settings and i’m pretty sure user.js can’t – i think you’d have to roll your own solution for that

      the only 2 files i know of that you probably don’t want to transfer are .parentlock and times.json – also make sure Firefox is not running if you copy a profile manually

  9. Hello. I’m probably too big of a dummy (read: noob) but how do I make Firefox stop asking me if I want to save login credentials every time I log in on a website?
    Thank you for you time.

    1. I know it can be disabled in the preferences tab but it gets overwritten every time I close the browser and I can’t seem to find what and where I need to make modifications.

      Also while I’m at it, is there any way to avoid making the search box to prompt that annoying green ‘+’ when there’s an available search engine?

      I hope my english is not that bad.

        1. CustomCSSforFx was updated today and i happened to come across the style you’re looking for to hide the Glass + thingy in the search bar…

          /* remove search indicators '+' sign */
          .searchbar-search-button[addengines=true] > .searchbar-search-icon-overlay {
          visibility: hidden !important;

          stick that in /chrome/userChrome.css in your Firefox profile (create the folder and file if necessary) and make sure ‘toolkit.legacyUserProfileCustomizations.stylesheets’ is ‘true’ in about:config

          1. Thank you, worked like a charm. I have another dumdum question: after a lot of trial and error, I had to set network.http.referer.XOriginPolicy to 0 because I was having issues on a site I use everyday. I see there’s a network.http.referer.XOriginTrimmingPolicy too. On the ghack user.js it is left at the default value but now that I have the other entry set at 0 too, should I change it or it’s pointless/redundant?
            Sorry if I don’t make sense and thank you again for your time.

            1. if you’re using uMatrix, you can set network.http.referer.XOriginPolicy = 0 and enable ‘Spoof Referrer header’ in uM in the global scope (can also do this by adding referrer-spoof: * true in ‘My Rules’ tab), then you can toggle the setting per-domain with uM (the 3 dots button)

  10. I am enjoying your write ups on achieving privacy and setting reasonable standards and expectations when browsing the web.

    I’ve applied the arkenfox user.js and your overrides successfully but am missing one feature: the search from URL bar. I know you recommend using the dedicated search bar, but my muscle memory always has me attempting to use the url bar first.

    I’ve tried setting the appropriate flags in your user-overrides and reapplying, but to no avail. What are the proper flags I should be resetting?

    Thanks very much.

    1. i suggest retraining your muscle memory :)

      honestly i’m not entirely sure what the repercussions of using the address bar to search are any longer, but i know this was a major privacy and security risk in the past – i should probably refresh my knowledge on this because i’m not certain it’s still an issue, though it probably depends on some Firefox preferences regarding searching – if anything you type gets sent over the net, then it’s certainly still an issue

      that said, if you still don’t want to use the search bar, then in your user-overrides.js…

      browser.urlbar.oneOffSearches = true = false

      there’s a couple other ‘search’ prefs in user-overrides you might want to look at – in your code editor, Ctrl+F and search for: search

      don’t forget to run the updater script when your done

  11. Does anyone get this error when running the

    ./ line 7: syntax error near unexpected token `newline’
    ./ line 7: `’

    … and does anyone know what to do about this?

    I have tried running dos2unix on the file, after of course having made it executable, but this doesn’t make the error disappear. Thank you for any help!

  12. @Pants; @12Bytes

    Exactly. The problem was with pref “security.cert_pinning.enforcement_level” having a value of ‘2’ (strict). I solved it by changing the value to ‘1’ in “user-overrides.js” by

    When I read these comments and thought about it, I decided to follow it up in good faith.

    Uninstalled Adguard ad blocker from the system. I had a lifetime license to use it two PCs and three smartphones/tabs. Frankly speaking, I uninstalled it reluctantly. It was my money sitting in the system tray and the browser doing its thing. Then I disabled these components in Kaspersky:

    1) Mozilla Firefox and Thunderbird
    Scan secure traffic in Mozilla applications
    If secure traffic scan is enabled, access to websites via the HTTPS protocol may be blocked. (This setting is buried inside somewhere. If you disable only 2-5 below, it doesn’t help as far as Firefox is concerned).

    2) Safe Money
    Protects your data on websites of banks and payment systems.

    3) Traffic processing
    Inject script into web traffic to interact with web pages.

    4) Private Browsing
    Protects against collection of information about your activities on websites.

    5) Anti-Banner
    Blocks banners on websites and in some applications.

    Went back to “user-overrides.js” by and deleted the added line: user_pref(“security.cert_pinning.enforcement_level”, 1); // 0=disabled 1=allow user MiTM (such as your antivirus), 2=strict. And updated the user.js by using updater.bat and prefsCleaner.bat.

    Firefox is blazing fast without issues (barring Invalid request. Err 2034C). The UI of uMatrix is different now. It doesn’t display any Adguard or Kaspersky elements. Using uMatrix and uBlock Origin is pleasant and straight forward. Web sites load faster and cleaner.

    Now, is there a solution for this: Invalid request. Err 2034C. It happens when I try to login to a site using my Google id.

    Thank you guys for your invaluable help.

    1. Went back to “user-overrides.js” by and deleted the added line: user_pref(“security.cert_pinning.enforcement_level”, 1);

      that’s a mistake, and maybe i need to make it clearer in the ‘dummy’ guide; you never edit any existing prefs in prefs.js, user.js or user-overrides.js (assuming you’re using mine) – any pref you want to change you need to copy to the appropriate section of user-overrides.js (near the bottom) where you can then change it’s value

      or if you just want to test something, you can change the value using about:config without editing any files but of course it will be changed back upon restart (which is what you experienced earlier because user.js had a different value)

      in this case you’re ok because you deleted a pref in user-overrides that exists in user.js and so Firefox reset the value to ‘2’ upon restart as you probably expected it would, but if you make a habit messing with the default prefs in any of the aforementioned files, you’ll make updating them far more difficult

      as for your new error, had you poked around on the web you might have come across a potential clue: CSRF – and if you search the user.js (the arkenfox one) for ‘csrf’ you might find more clues

      are you spoofing the http referrer? perhaps with an add-on? or did you change that pref?

      there’s several things you can do to troubleshoot – one is to spin up a new, default FF profile (about:profiles) and connect to the site you have trouble with – if you can then connect, this will tell you there’s an issue in your other profile and so the hunt is on – to solve these issues yourself, see this.

      this can be frustrating at first, but once you get the kinks worked out things will go much smoother

      let me know how you made out

      1. Went back to “user-overrides.js” by and deleted the added line: user_pref(“security.cert_pinning.enforcement_level”, 1);

        that’s a mistake, and maybe i need to make it clearer in the ‘dummy’ guide; you never edit any existing prefs in prefs.js, user.js or user-overrides.js (assuming you’re using mine) – any pref you want to change you need to copy to the appropriate section of user-overrides.js (near the bottom) where you can then change it’s value

        But it was not a line that existed in your user-.js, no? I added it as a solution to the ‘2’(strict) problem I had because of the AV. And I deleted it as it deemed fit to my uninformed thinking. Please clarify.

        I’ll follow up the other hints and post. Regards.

        1. i think i confused you because i’m not explaining things clearly – let’s see if this helps…

          you should NEVER edit/delete/comment out any of the existing prefs in prefs.js OR user.js IF you are using the ‘arkenfox’ user.js

          you should NEVER edit/delete/comment out any of the existing prefs in user-overrides.js IF you are using mine with the following exception: if you need to change anything in the ‘arkenfox’ user.js, or my user-overrides.js, you should COPY the entire line you want to change to the USER CUSTOMIZATION section near the end of my user-overrides.js where you can then change the preference value

          if you are NOT using my user-overrides, but you still have one, then you can edit it all you want

          if you are using the ‘arkenfox’ user.js, then, unless you do not want to change anything in it, you should be using a user-overrides.js (mine or otherwise) along with their script

          does that clear things up? :)

          1. perhaps i should also add to that that having multiple instances of the same preference in any of the config files does not present any problem – Firefox reads the config files from the top down (prefs.js, then user.js), so if there’s duplicate prefs, the value for the last one will be applied

            user.js (or user-overrides.js):

            user_pref("this", true);
            user_pref("this", true);
            user_pref("this", false);


              1. don’t know what to say about that – seems it’s usually attributed to google, though possibly not always

                i would create a new, empty profile for testing and then copy into it everything from your privacy profile EXCEPT prefs.js and user.js – if you still have the problem, then it may be an add-on – if you don’t, then it’s likely something in user.js in which case i’d then copy that to the testing profile and do this

          2. “if you are using the ‘arkenfox’ user.js, then, unless you do not want to change anything in it, you should be using a user-overrides.js (mine or otherwise) along with their script”.

            Very clear. No doubts about it now. Thank you.

  13. I read about using ‘user.js’for configuring Firefox browser in a German blog (in English translation) and a book (German, translated into English). Then I read about it in and finally in 12bytes.o rg. This quest was the continuation of my fascination with rooting my Android smartphone.

    This particular section of titled “The Firefox Privacy Guide For Dummies!” is intended to help novices (dummies) like me. But, the sad truth is that dummies rarely seek help, because they don’t know that they need help. Help for what? For safeguarding themselves on Internet. The greatest impediment is the attitude that “I don’t have anything to hide from anybody”. In fact, it’s the height of ignorance.

    As long as common man views Google, Microsoft, Facebook, Twitter, etc., as knights on a mission to save humanity from ignorance, laziness and loneliness, there’s no way to help him see the the truth. For example, I stopped using WhatsApp and asked all my contacts who mattered to me to give it up and adopt Telegram instead. (I can see the author of laughing at me for the folly of my choice). Very little success.

    Fortunately, the author of “The Firefox Privacy Guide For Dummies!” has taken all these facts into account. Otherwise why should he painstakingly do “The Firefox Privacy Guide For Dummies!” section? The section “Firefox Configuration Guide for Privacy Freaks and Performance Buffs” would have been sufficient.

    I read both these sections a couple of times before deciding that I was not a dummy (because I’ve been using Firefox browser for so long)! So, I took “Firefox Configuration Guide for Privacy Freaks and Performance Buffs” as my guide and proceed to tame my Fox.

    Everything went fine. The browser (a new installation after uninstalling and deleting all traces of the previous one) configuration amazed me because it was super fast now and had very few add-ons. The web pages looked clean as if I was reading printed content on white paper. No shenanigans. Nothing!

    But suddenly trouble cropped up: No Google domains opened (and some other sites). I cross checked the configuration. Everything was fine. And that was the real problem: Everything worked as they should but I lacked knowledge and skill to tweak things when necessary. My prejudices (I’ve been using Firefox for so long, after all) had prevented me from beginning from the beginning: The Firefox Privacy Guide For Dummies!

    The author of was gracious enough to help me identify the problem and solve it. Did he solve it for me? Not really. He showed me how to solve it by leading me back to “The Firefox Privacy Guide For Dummies” section.

    Now you know where to begin. From the very beginning itself.

    Why should people like the author of this blog take the pain to offer their knowledge, skill, time and effort to us unasked? He and I are hemispheres apart.

    Maybe, because they know the true meaning of the trite saying: Sharing is caring. And they have commitment.

    1. The greatest impediment is the attitude that “I don’t have anything to hide from anybody”. In fact, it’s the height of ignorance.

      very well said!!!

      Why should people like the author of this blog take the pain to offer their knowledge, skill, time and effort to us unasked? He and I are hemispheres apart.

      we’re all human beings sharing one tiny planet and from that perspective you’re just around the corner :)

      thanks much for your kind comments Murali, and i’m glad you persevered

      for the record, the problem in this case was the pref security.cert_pinning.enforcement_level having a value of ‘2’ (strict), which is the current default in the ‘arkenfox’ user.js – i don’t understand this pref fully, but apparently that caused a problem with this persons anti-virus

      1. > the problem in this case was the pref security.cert_pinning.enforcement_level having a value of ‘2’

        No, the problem was the end user allows AV to act as a MitM and slurp up all his browser traffic. Personally, browsers are some of the most secure and protected pieces of software on the planet (by default: e.g among others, Safe Browsing lists curated by Google, which has the resources to do this right – e.g constantly adding protections for xss and other mechanisms, and MOAR), not to mention if you have Tracking Protection and/or uBlock Origin (and/or uMatrix) with blocklists and hosts lists and controlling JS etc – that forget about the tracking – the ATTACK surface is massively reduced

        At the end of the day, most damage is done by the end users (social engineering, visiting suspect websites, falling for BS), and the real solution here is to cut out the middle man – configure that AV to not interfere with web traffic.

        PS: “Don’t touch my tabs” vs earthlng’s “window opener be gone”
        – xpi is here: )
        – see

        1. i realize that completely and it wasn’t my intention to imply that the problem was with the user.js – perhaps i should have worded it better – what i meant was that this pref caused a problem in this case for this user

          the guy is a good guy and he’s trying, but no one is born knowledgeable – i politely scolded him in emails we exchanged about running Windows and 2 AV’s and now he’s interested in giving Linux a spin

          and thanks much for the window.opener info – i didn’t realize earthing’s worked differently

            1. these AV “suites” ARE a virus! the only proper way to uninstall some/many/all of them is to reinstall the OS – i learned long ago in my Windows days that a resident AV scanner is largely unnecessary, at best, provided the user is smart about what they do on-line and they use a decent on-demand scanner

              as i’ve said in this article, trusting your AV to keep you safe is like trusting guard rails to keep your car on the road

              thanks for the info – it reinforces my decision to keep ‘security.cert_pinning.enforcement_level’ at ‘1’, at least for now

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