NUMAN789 Firefox has been my main browser. After I installed 2.0.0.7 I began to have problems (getting progressively slower with time, spinning beach balls...etc) and had my first kernel panic. After the second panic I tried all the recommended procedures (TechToolPro, Apple first aid, Onyx, Repaired permissions...etc). But the only way I could get back to a more state was to revert back to FFx 2.0.0.6 and since then all has been well. I have looked for but haven't seen anyone posting about problems such as mine. Each panic came after going to 2 or 3 web sites first thing in the morning.
(Version 2.0.0.7)