This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox displaying everything with weird characters after update

  • 2 replies
  • 0 have this problem
  • 6 views
  • Last reply by zeroknight

more options

This happened after updating to the latest Firefox. I have even tried to delete the Library/Application Support/Firefox folder (Mac) to no avail.. any ideas?

This happened after updating to the latest Firefox. I have even tried to delete the Library/Application Support/Firefox folder (Mac) to no avail.. any ideas?
Attached screenshots

All Replies (2)

more options

Well that's definitely not helpful.

I think the tabs and address bar typically use your default system font, and not a font you can change on the Settings/Preferences page.

Hopefully a Mac person will have a suggestion on how to work around this. If you haven't done a normal system shutdown and restart, I would do that next, and then I think FontBook has some kind of "repair" feature that sometimes helps (at least with fonts that go crazy on web pages).

more options

Try resetting your system fonts:

Font Book > Settings > Advanced > Reset