Use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar. If you use "Clear history when Firefox closes" to clear the cookies then try to exclude the cookies and instead let the cookies expire when you close Firefox to make them session cookies. *Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: Keep until: "I close Firefox" Create a cookie 'allow' exception for cookies that you would like to keep. *Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: Exceptions ---- If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix: *bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx You can find the Report ID of recent crash reports on the "Help > Troubleshooting Information" page (about:support). *Click the "All Crash Reports" button on this page to open the <b>about:crashes</b> page and see all crash reports. If necessary then you can open <b>about:</b> pages via the location/address bar. See: *http://kb.mozillazine.org/Mozilla_Crash_Reporter *https://support.mozilla.org/kb/Mozilla+Crash+Reporter