How do you change the font used in the tabs, the bookmark shortcuts, and the address bar?
Somehow I changed the font used in the tabs, the bookmark shortcuts, and the address bar. I'm not sure how I did it, but I don't like the font I chose and now I don't know how to change it back.
Alla svar (1)
It is possible that the change is caused by a corrupted or missing font that made Firefox switch to another font.
You will have to check (core) fonts like Tahoma to make sure that you still have them all and that they are working.
You can use the System File Checker to check if font files are missing or corrupted.
System Files - SFC Command - Vista Forums: