Thanks to 'theltalpha' who pointed out that there was a syntax error in my last update of my user-overrides.js for Firefox.
The error has been corrected and v75r2 has been released. Here's the direct link to the file.
This oversight on my part is not only a reminder to myself to make sure to perform all integrity checks on the file before release, but also a reminder to all those using it to do the same. Both the regular expression test and the browser console test would have revealed the error, however i apparently performed neither.