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Firefox UI font messed up on Ubuntu. How to reset?
Hi, I'm using Firefox 90 browser on Ubuntu 21.04. Somehow the UI font for my profile changed from the default and I can't find any way to reset it (see bad_ui_font.png) My tabs, menus and preferences all got set to some fixed-width font, and I can find anywhere in the preferences or about:config, or in my profile folder where I can change it back. If I create a new profile, then the UI font is fine (see good_ui_font.png). But as soon as I login to my firefox account and sync, then the new profile gets the bad UI font. I don't want to have to recreate my profile from scratch and lose all my settings just to correct the UI font. But this is very annoying. How can I restore the default UI font?