uBlock Origin Suggested Settings

uBlock Origin

Recent changes to this guide are listed at the end of the document.


First and foremost, use only uBlock Origin (uBO) by Raymond 'gorhill' Hill (here's the uBlock Origin page on the Firefox Add-ons website). While there may be some legitimate forks, there are also many ripoffs out there, including one named 'uBlock', and i would highly recommend avoiding them.

uBlock Origin is not simply an ad blocker, rather it is a powerful content filter, similar to a firewall, that is capable of both dynamic and static filtering. In addition to blocking annoying content such as ads, it can also dynamically block JavaScript, frames, images, 3rd party fonts and more, all of which help to prevent tracking and malware.

Working with uBO requires an understanding of static and dynamic filtering. Static filters are filter rules which are provided by the authors of the various filter lists. Essentially you have no control over static filters; you either enable a filter list, or you don't. Static filters attempt to block content like ads, malware, tracking technologies, annoyances and more. The static filter lists are enabled from the 'Filter lists' tab of the uBO dashboard. Dynamic filters are controlled from the pop-up interface when you click the uBO toolbar icon. Here you can create temporary or permanent filter rules to dynamically control the loading of images, JavaScript and frames on a global or per-domain basis. Dynamic filtering only becomes available after enabling the 'I am and advanced user' option in the uBO settings and it is crucial to read the uBO wiki before doing so.

Following are my personal preferences for setting up uBlock Origin. There are no "best" settings since every use case is different, however i like to think they are generally sensible settings to start with. The configurations in the 2nd and 3rd columns of the table are intended to be used with the The Firefox Privacy Guide For Dummies! and the Firefox Configuration Guide for Privacy Freaks and Performance Buffs, respectively. In the former case the advanced mode option is disabled because i thought it might be too overwhelming for followers of the 'dummy' guide.

Regardless of which guide you are following, it is essential that you read the uBlock wiki with the exception of the Advanced-user-features section if uBO's advanced mode will not be enabled. If you are not following either guide i would suggest enabling the advanced mode option in order to leverage its dynamic filtering capability, as well as reading the Advanced-user-features section of the wiki.

Once uBO is installed, click its toolbar icon to reveal its popup user interface, then click the little sliders icon to reveal the "secret" Dashboard (i say "secret" because apparently some users don't know it exists). Following are the settings i recommend:

'Settings' tab

Settings not shown here are optional.

Setting name
'Dummy' guide settings
Advanced guide settings
Hide placeholders of blocked elements 1 disabled optional
Show the number of blocked requests on the icon enabled optional
Disable tooltips disabled optional
I am an advanced user 2 disabled enabled
Disable pre-fetching enabled enabled
Disable hyperlink auditing enabled enabled
Block CSP reports enabled enabled
Uncloak canonical names enabled enabled
Default behavior:
Disable cosmetic filtering enabled enabled
Block media elements larger than [50] KB disabled optional
Block remote fonts 3 disabled disabled
Disable JavaScript 4 enabled optional

1 - If you are new to uBO and content filtering, you should probably not enable this option. Leaving this option disabled will sometimes provide a visual indication when something is blocked in the form of a placeholder where the object was, thus letting you know that something was blocked.

2 - This option may be enabled only after reading the Advanced user features section of the uBO wiki.

3 - Instead of blocking remote fonts globally and then allowing them per-site, you can automatically allow all 1st party fonts while blocking only 3rd party fonts. See the 'My filters tab' section below for more information. Novice users, or those that simply don't want to fool with filters for unblocking a 3rd party font needed for a given domain, may find it easier to set this to 'enabled' and then allow all remote fonts (1st and 3rd party) as needed from the uBO Dashboard.

4 - Enabling this option disables JavaScript globally by default and causes uBO to honor <noscript> HTML tags. A potential problem with this is that some page elements that might have been displayed had the <noscript> tags been ignored, may not display when this option is enabled. On the flip side, some websites may display a JavaScript disabled warning message which can be beneficial for novices. Also see Display website content hidden by JavaScript. For anyone concerned with their on-line privacy, JavaScript must be disabled globally, then allowed only for the websites where the functionality it provides is necessary. If you are following the advanced guide then you can either enable the 'Disable JavaScript' master switch in uBlock's settings, or block inline, 1st party and 3rd party scripts from the uBlock toolbar popup.

'Filter Lists' tab

Filter lists:
Auto-update filter lists enabled
Suspend network activity until all filter lists are loaded enabled
Parse and enforce cosmetic filters disabled
Ignore generic cosmetic filters enabled
Network filters:  
My filters enabled
uBlock filters enabled
uBlock filters – Badware risks enabled 1
uBlock filters – Privacy enabled
uBlock filters – Resource abuse enabled
uBlock filters – Unbreak enabled
AdGuard Base disabled
AdGuard Mobile Ads disabled 2
EasyList enabled
AdGuard Tracking Protection disabled
AdGuard URL Tracking Protection enabled
Block Outsider Intrusion into LAN enabled
EasyPrivacy enabled
Malware domains:
Online Malicious URL Blocklist enabled
Phishing URL Blocklist enabled
PUP Domains Blocklist enabled
AdGuard Annoyances enabled
AdGuard Social Media disabled
Anti-Facebook List disabled
EasyList Cookie disabled 3
Fanboy’s Annoyance disabled
Fanboy’s Social disabled
uBlock filters – Annoyances enabled
Dan Pollock’s hosts file disabled
MVPS HOSTS disabled
Peter Lowe’s Ad and tracking server list enabled
ClearURLs for uBo (unofficial) 4 https://raw.githubusercontent.com/DandelionSprout/adfilt/master/ClearURLs%20for%20uBo/clear_urls_uboified.txt

1 - Optional for Linux users, highly suggested for non-technical Windows users

2 - Enable if using Firefox on a mobile device

3 - Enabling this list will hide a lot of those idiotic cookie notices however this list is already included in the Fanboy’s Annoyance list if you wish to enable it. In the future Firefox will apparently offer an option to block a lot of these retarded cookie notices so hopefully no list will be necessary.

4 - Removes tracking parameters from URLs. This list replaces the basic functionality of the Clear URLs add-on. For a description see this.

Don't worry about the 'Regions, languages' section unless you browse sites in languages other than English in which case you'll want to enable those languages.

There are millions of additional filter lists available for uBO, however i strongly advise you to be very careful about what ones you add, if any. In my experience the default filter lists offered by uBO are quite sufficient for general web browsing and adding more will use more memory, slow things down and potentially cause more conflicts and breakages.

'My filters' tab

You might wish to disable the 'Block remote fonts' option on the 'Settings' tab add the following to the 'My filters' settings instead. Depending on which line you uncomment (remove the ! ) you can allow all 1st party fonts while blocking all 3rd party fonts, or block all 3rd party fonts except for a single domain, or block all 3rd party fonts except for multiple domains. As written, the code below will allow all 1st party fonts while blocking all 3rd party fonts. All lines beginning with ! are comments and are not read by uBO. Only uncomment one line.


! uncomment the line below to allow 1st party fonts + block 3rd party fonts (default):

! uncomment the line below to allow 1st party fonts + allow 3rd party fonts for a single domain (example.com):

! uncomment the line below to allow 1st party fonts + allow 3rd party fonts for multiple domains:

'My rules' tab settings

If you are following the Firefox Configuration Guide for Privacy Freaks and Performance Buffs or otherwise using uBO on its own, and you have enabled the 'I am an advanced user' setting, you can optionally replace the default behind-the-scene rules on the 'My rules' tab with the the following, however understand that these filters can break some websites for which you may need to add exceptions by using uBlock's logger feature:

no-large-media: behind-the-scene true
behind-the-scene * 1p-script block
behind-the-scene * 3p block
behind-the-scene * 3p-frame block
behind-the-scene * 3p-script block
behind-the-scene * image block
behind-the-scene * inline-script block

If you are using the LocalCDN add-on you will need to add some rules to the 'My Rules' tab in the uBO Dashboard. The rules can be found in the preferences section of the LocalCDN add-on from where you will copy the rules specific to uBlock and paste them on a new, blank line in the 'Temporary rules' section of the 'My Rules' tab. Make sure to save and commit the changes. When adding the rules, be sure to remove any conflicting rules for the same domains if there are any (there won't be if you're starting fresh).

Dynamic filtering

If you are running uBO with its 'I am an advanced user' option enabled in order to activate dynamic filtering, i recommend setting the following rules in the 'Global rules' column of the popup interface:

uBO Global Settings

If you decide to block '3rd-party' (all 3rd party content) globally, uBO will not be able to update its filter lists until you create a 'noop' rule for the Filter Lists settings page which you can do from the dashboard pop-up interface while viewing the Filter Lists page.

uBO Global Settings

Recent changes


  • corrected footnote error in 'Filter Lists tab' section - thanks to 'Chris' (in the comments)


Note that both reader and my comments, while they may have been accurate at the time, might not be inaccurate today. This is a highly dynamic environment so please verify the accuracy of a comment should you wish to utilize it. Failing that, ask me and i'll give it a crack.

160 thoughts on “uBlock Origin Suggested Settings”

    1. that’s just a suggestion – from what i understand cosmetic filtering adds substantial overhead to uBO and personally i don’t see any real benefit from it – in my case i block elements using CSS

  1. Thank you for the awesome guide. I am making the change to enabling the “I am an advanced user” option to leverage uBlock’s dynamic filtering.

    I have set the “Global rules” for “inline scripts”, “1st-party scripts”, “3rd-party scripts”, “3rd-party frames”, but it is unclear to me if JS should still be disabled globally in “Settings” or if these 4 global rules in the dynamic filter does the same thing. In the case of dynamic filtering however, instead of flipping the Java Script switch on a per site basis for example you edit the dynamic rules instead. I hope I am making sense.

    I suspect disabling JS globallly is not required anymore with those 4 dynamic rules set, i just want to do a sanity check.

    1. > …it is unclear to me if JS should still be disabled globally in “Settings”…

      no, the global rules you set will do the job

      > I suspect disabling JS globallly is not required anymore with those 4 dynamic rules set


      > In the case of dynamic filtering however, instead of flipping the Java Script switch on a per site basis for example you edit the dynamic rules instead.

      if you haven’t read the uBlock wiki, please do so

      i’m a little confused by your question – you need not “edit” anything, you click the appropriate rule scope on the main pop-up

      you’re at 12bytes.org, so if you want to allow scripts to run here, in the right column (local) you would click the gray box – if you wanted to allow other sites to run scripts from here, which there’s no reason to do, then you click the gray box in the left column (global)

    2. > I have set the “Global rules” for “inline scripts”, “1st-party scripts”, “3rd-party scripts”, “3rd-party frames”,

      by that i assume you mean the corresponding boxes in the left (global) column are all red which is correct for a default-deny scenario

    1. are you allowing 1st party fonts via the filter?

      how does the fanboy list differ from blocking 3rd party? i would think that any less breakage with that list would be due to missing rules but i’m not familiar with filter syntax so i’m not really sure what he’s doing there

      blocking 3rd and allowing 1st still breaks some sites (where web developers are too stupid to self-host their fonts), but not a lot for me personally – i tend to just mouse-over the broken characters to discover what they link to if i need to

      1. Yes, allowing first party, only blocking third party, and as you wrote, it does indeed break some sites.
        Maybe you’re right and it might be only the missing rules.

        1. it’s an annoyance for sure and it’s the “modern” web dev that’s to blame, at least in part – one thing you can do is complain to the site owner, but i think the mass adoption of ad blockers is also putting a lot of pressure on devs to hopefully clean up their act but it may be too late for that

          i think the web is going to split at some point between the corporate garbage and an “underground” web – of course this has already taken place with Tor, IPFS, etc., but it isn’t widely adopted… yet

          i want to start to get on that bandwagon by converting this site to a static site (pure html and css) and, when it’s time, stick it on IPFS or some other P2P distributed infrastructure

    1. hallo back! if cosmetic filtering is useful to you, by all means, go ahead and enable it, but i prefer to inject CSS where needed to hide crap i don’t want to see

      from the Dashboard: Filter lists page:

      Parse and enforce cosmetic filters

      Uncheck this option if you do not want cosmetic filters from various filter lists to be parsed and enforced. This option is mostly of interest for those who want to further reduce uBO’s memory and CPU footprint. Cosmetic filtering has no value privacy-wise, its only purpose is to hide elements on a web page that can’t be blocked otherwise.

      Ignore generic cosmetic filters

      Generic cosmetic filters are those cosmetic filters that are meant to apply on all websites. Though handled efficiently by uBO, generic cosmetic filters may still end up contributing measurable memory and CPU overhead on some web pages, especially the large and long-lived ones. Enabling this option will eliminate the memory and CPU overhead added to web pages as a result of handling generic cosmetic filters, and also lower the memory footprint of uBO itself. This option can be enabled on very low-end devices, but mind that some filter lists (EasyList Cookie for ex.) rely on generic cosmetic filters a lot, so they may pretty much stop working.

  2. Hallo! In the “Settings” tab, footnote 3, you say “Disable hyperlink auditing” may remain disabled (in other words: hyperlink auditing will be allowed) as long as dom.security.https_only_mode is enabled in the Firefox settings. That means, someone who uses arkenfox’ user.js will be tended to uncheck “Disable hyperlink auditing”. The question is: How is the dom.security.https_only_mode setting linked to hyperlink auditing? If I read the description in uBlock Origin’s wiki, I fail to establish why enabling dom.security.https_only_mode would render “Disable hyperlink auditing” redundant.

    1. > How is the dom.security.https_only_mode setting linked to hyperlink auditing?

      it isn’t – over time i added 1 or 2 additional footnotes and added or removed information in the settings table as changes were made to uBO and somewhere in there the footnote numbers in the table fell out of sync with the footnotes

      thanks for pointing this out – it’s been corrected

  3. ClearURLs for uBo (unofficial) pointing to the wrong footnote – 5 instead of 4.

    3 – Enabling this list will hide a lot of those idiotic cookie notices however this list is already included in the Fanboy’s Annoyance.
    However, Fanboy’s Annoyance isn’t set to enabled, which it should?

    1. thanks Chris – footnote error corrected – as for cookies, i left that list disabled intentionally due to Firefox’s ability to segregate storage, however maybe i should re-evaluate that – also Firefox is supposed to offer an option in the near future to block these retarded cookie notices

      1. the last part was actually about the fact that you mention the “Fanboy’s Annoyance” under Footnotes No. 3, but this is not enabled at all, according to your list? I think it was in the past.

        Good on mozilla if they block those retarded notices in the future without any extentions.

        1. yeah, i understand how #3 footnote could be a little confusing so i changed the wording – and yes, i probably did have the list enabled before at one point

          these are only suggested settings to use as a starting point though – people can of course do what they want with the these options

          again, thanks for letting me know about this

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