The System Details list next to the question shows that you run an older Firefox 50.0.2 version that is no longer supported with security updates. Always update Firefox and Add-ons to the latest versions to get all security fixes. Please update to the current Firefox 50.1.0 release. *Help -> About Firefox *https://support.mozilla.org/kb/update-firefox-latest-version ---- If you have submitted crash reports then please post the IDs of one or more recent crash reports that start with "bp-". *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. Alternatively you can open about:crashes via the location/address bar. See also: *http://kb.mozillazine.org/Mozilla_Crash_Reporter *https://support.mozilla.org/kb/Mozilla+Crash+Reporter