I don't know how it happened, but the font that my browser uses (FireFox) to display text has changed to MarkerFelt/FeltMarker. I have already gone in to preferences and there it says what it should, i.e. Times/Helvetica/_serif/_sans, etc. It makes it ver hard to read search results, YouTube descriptions, really anything on-line. How do I get the proper font to display in my browser again? Please help.