The Mozilla sofware itself have lost it's fonts - there's no text in the menubar, just blanks
The fonts in the mozilla software is gone. The menu bar and buttons are blank. I can't therefore navigate properly in the browser since i just guess what each button is for. I also misses text in the window where to put the adress for websites. Very annoying issue...
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First, try to reset Firefox. Refresh Firefox - reset add-ons and settings. This simple step will eliminate many Firefox problems with only one click.
A few other basic trouble shooting things you can try is this: Run all Windows Updates, install all needed service packs, etc.
Update your graphics driver (Firefox uses your graphics card for some rendering, and an out of date graphics card driver can cause problems. Upgrade your graphics drivers to use hardware acceleration and WebGL
Update all your plugins (Flash, Java, etc.): http://www.mozilla.org/plugincheck/.
Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/. This helps check that there are no viruses on your computer causing issues. You can uninstall this program after you clean off any infections.
You can do a font test to see if you can identify corrupted font(s).