I've been designing/coding my website and was making some browser adjustments a few weeks ago. Nothing major. I don't think it caused the problem as this just happened 2 days ago when I turned my computer on to start work. The font is now very hard to read in Firefox but only on specific websites such as Twitter & http://addons.mozilla.org/ for example. It looks better in IE but I'm not sure if it's just being rendered different. I'm not sure if it's a problem with my computer or Firefox. and nothing has changed on my actual computer (as far as I can tell).
I may have uninstalled some languages for windows 7 that I wasn't using. I would assume that would effect it... But maybe it did?
I'm hoping someone out there has had this problem and knows the easy fix.
Note that I've tried changing all my font settings in Firefox and it has no effect. I have attached 2 screenshots of my browser font settings and the actual problem text I'm seeing.