Hi, You can update Firefox via '''Help''' ('''Alt''' + '''H''') > '''About Firefox''' and check. Alternatively from https://www.mozilla.org/en-US/firefox/new/ [https://www.mozilla.org/en-US/firefox/update/ Updating] If the problem persists you can try to right-click and '''Toggle''' the key '''toolkit.telemetry.enabled''' to '''True''' and also set '''toolkit.telemetry.prompted''' to 2 in [http://kb.mozillazine.org/About:config about:config]. If the second key is missing you can right-click > '''New''' > '''Integer''' and enter '''toolkit.telemetry.prompted''' in the first prompt, and 2 in the second prompt. [http://kb.mozillazine.org/About:config_entries about:config Entries] The [https://services.addons.mozilla.org/en-US/firefox/discovery/addon/config-descriptions/ Config Descriptions] add-on adds helpful source comments in about:config. If the above fails you can reset Firefox and start afresh. The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.'' To Reset Firefox do the following: #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox" button. #Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish. #Firefox will open with all factory defaults applied. Further information can be found in the [[Reset Firefox – easily fix most problems]] article. Did this fix your problems? Please report back to us!

You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default values. *http://kb.mozillazine.org/Preferences_not_saved *http://kb.mozillazine.org/Resetting_preferences