in order to let us work out a testcase, its important that you try if your problem is a) reproducible and b) if it is due to an extension.
For b) try running firefox in -safe-mode: # firefox -safe-mode and see if it goes away. If so, try disabling extension s one by one to find the bad extension and let us know which one caused the troubles. -- Firefox Freezes opening tabs or windows https://launchpad.net/bugs/90140 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
