The crash ID that you posted seems to be missing the last digit. *https://crash-stats.mozilla.com/report/index/0a84b232-cb23-49d8-ac90-b2b602140121 Try to create a new profile as a test to check if your current profile is causing the problems. See "Creating a profile": *https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem. *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox ----- Note that your System Details List shows multiple Flash plugins. # Shockwave Flash 12.0 r0 # Shockwave Flash 11.6 r602 You can find the installation path of all plugins on the <b>about:plugins</b> page. You can check the Flash player installation folder for multiple Flash player plugins and remove all (older) version(s) of the plugin (NPSWF32) and (re)install the latest Flash player. *(32 bit Windows) C:\Windows\System32\Macromed\Flash\ *(64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\