Setting "allow pages to choose their own fonts" on a per-domain basis in Firefox

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.

https://bugzilla.mozilla.org/show_bug.cgi?id=568794

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

https://addons.mozilla.org/en-US/firefox/addon/document-font-toggle/?src=api

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.