You can find the Report ID of recent crash reports on the "Help > Troubleshooting Information" page (about:support). bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx If the "bp-" prefix is missing then click its line on the about:crashes page to submit the crash report and the crash report will get a "bp-" prefix (do not add it yourself). See: http://kb.mozillazine.org/Mozilla_Crash_Reporter https://support.mozilla.org/kb/Mozilla+Crash+Reporter You can check if it helps to start Firefox in Safe Mode by holding down the Shift/Options key. You can set all plugins to "Ask to Activate" on the "Firefox/Tools > Add-ons > Plugins" page to check for issues caused by plugins.