I tried every solution including, deleting .fontconfig from home directory, changing all the font settings in KDE, and installing new fonts. Some of these tricks helped for one time, and then reverted to the junky font again.

The only solution which works somewhat for me is adding these lines to /home/user/.mozilla/microb/prefs.js

user_pref("font.default.x-western", "sans-serif");
user_pref("font.language.group", "x-western");
user_pref("font.name.monospace.x-western", "Nokia Sans");
user_pref("font.name.sans-serif.x-western", "Nokia Sans");
user_pref("font.name.serif.x-western", "Nokia Sans");

which helps for most text on most webpages, however the text inside the buttons and elsewhere is still messed up.

Also I noticed that the font inside the built-in map program also gets messed up, and I think I noticed it in other programs as well.

Does anyone else have messed up fonts in any other programs?