Normally I use Firefox with the option "allow pages to choose their own fonts" UNselected, but now and again there's a site I'd like to view using their fonts instead of mine... Is it possible to set this option on a per-domain basis? A plugin maybe?


There are two Firefox add-ons that are open-source and can be used to solve the problem in another way than setting "Allow pages to choose their own fonts":

Both add-ons allow to override the CSS styles of websites, and both support @-moz-document rules, which allow regex specifications for overridden websites, including negative look-ahead.

These examples come from the article Applying styles to specific sites:

An example of matching all sites with a certain exception:

@-moz-document regexp('(?!http://www\\.example\\.com).*') {
      the code in here applies to all URLs except those that start with 

An example of matching all except a specific section of a site:

@-moz-document regexp('http://www\\.example\\.com/(?!members).*') {
      the code in here applies to all URLs on http://www.example.com, except
      those under http://www.example.com/members

I've found a bug in the Bugzilla of Mozilla. If you still interested in this problem, you can add a comment with your requests.



I had a similar problem and found this plug-in:


It allows to toggle between choosing your own fonts and use the ones set by the site. It also has pre-sets for "always allow" and "always deny" by domain so you don't have to manually toggle.

Hope this is helpful.

  • How should this be implemented on a per domain level? Looking at the source code it does not look like that there is this functionality. The issue is that browser.display.use_document_fonts is a global setting for all sites. – DreamFlasher Oct 24 '18 at 1:54
  • 1
    The addon has been deleted. – user598527 Apr 22 at 20:51

It looks like this might be what you're looking for: https://addons.mozilla.org/en-US/firefox/addon/stylish/

  • Sadly here userstyles.org/help/coding it says that "there is no way to select everything except a certain site", so Stylish doesn't fit with my scenario :/ – Joril Jun 19 '11 at 9:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.