Firefox 6.02 freezes (doesn't respond) regulary (say every 8-10min.) for around 15-20 seconds, and then comes back to life again. Firefox doesn't actually crash.
I thought at first it was related to videos, but if freezes nevertheless the application.
System and rest of applications function OK whilst Firefox is frozen, so the issue is only with Firefox.
Tried other web navigators and no problems.
Do you have McAfee Site Advisor plugin and is it enabled? If so, disable it and see if that helps.
Mozilla had disabled this plug-in several months ago because of several issues it was causing. But after upgrading to 6.0.2 I noticed it was enabled, again, and I was having significant issues with memory and CPU usage that primarily affected Firefox and McAfee anti-virus scans but also slowed down overall system responsiveness.
A couple of hours ago I disabled it and almost immediately all the issues I'd been experiencing went away.
We've identified a bug that may cause, under certain circumstances, periodic freezes of the Firefox UI, in terms of a short freeze every about 9 minutes. This only affects a small amount of users, so, if you don't notice this behavior, you can stop reading.
If you think you are suffering this bug, stay sure it will be solved in Firefox 8. In the meanwhile, here is a simple workaround to fix the issue: