you are using Firefox 11 beta, if you are not an expert, it is recommend not to use beta product. if you have step to reproduce please open a bugzilla account and describe your problem here * https://bugzilla.mozilla.org/show_bug.cgi?id=658780 i suggest you to switch to release channel * getfirefox.com

Create a new profile as a test to check if your current profile is causing the problems. See "Basic Troubleshooting: Make a new profile": *https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems. If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files. See: *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox ---- *http://kb.mozillazine.org/Firefox_crashes *https://support.mozilla.org/kb/Firefox+crashes