Hi, You can try to manually download the latest and upgrade: https://www.mozilla.org/en-US/firefox/new/ You may also want to [https://support.mozilla.org/en-US/kb/Backing%20up%20your%20information?s=backup&r=1&e=sph&as=s backup your current Firefox profile/settings/personal data] before upgrading. [https://support.mozilla.org/en-US/questions/926330 3.6 UI] [https://support.mozilla.org/en-US/kb/common-questions-after-upgrading-firefox-36?redirectlocale=en-US&redirectslug=common-questions-after-updating-firefox Common questions] [https://blog.mozilla.org/addons/2012/05/24/addons-firefox-3-6/ Add-ons] If problems persist you can Reset Firefox (a new feature) 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!

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.25) Gecko/20111212 Firefox/3.6.25 ( .NET CLR 3.5.30729) '''FBSMTWB''' Your Firefox useragent is stuck at Firefox 3.6.25 due to Fast Browser Search having been installed when you had Firefox 3.6.25. See https://support.mozilla.org/en-US/kb/websites-say-firefox-outdated-or-incompatible