I was having the same problem, and after doing some poking around on my system, I found it to be the wine/crossover office installed plugins that were installed. after removing them, firefox ran fine again.
Hope that was insightful to others who are still experiencing the problem. In your browser go to the URI about:plugins to see whats loaded. -- firefox freezes and turns gray https://bugs.launchpad.net/bugs/172419 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs