Can you give more information?1. What websites are you visiting that cause these problems, 2. What is your user-agent/build-identifier (type "about:" in location bar)
3. Have you tried Safe Mode? (see http://kb.mozillazine.org/Safe_Mode)
Also maybe try these: http://kb.mozillazine.org/Website_colors_are_wrong http://kb.mozillazine.org/Websites_look_wrong
