I saw this reported recently resetting the home page to the default (about:home) fixes the problem. Ref: https://support.mozilla.com/en-US/questions/907328 ''Why does my start page say "You're not on the latest version of Firefox. Upgrade today to get the best of the Web!" when in fact I do have the lastest version?'' '''Solution Chosen''' (posted by '''SafeBrowser'''): <blockquote> You may see that message below the Google search box on www.google.com/firefox which is the old Firefox default home page. It appears that page is no longer being maintained by Google. You appear to have the latest Firefox version. <br><br> If you want the Google search page as your home page, change your home page to about:home (a new, updated version of the old Google/Firefox home page is now built-in to Firefox). <br><br> See --> http://support.mozilla.com/en-US/kb/How+to+set+the+home+page <br><br> Also see --> https://support.mozilla.com/en-US/kb/Finding+your+Firefox+version You can also see your version on the Help > Troubleshooting Information display. ----- The simple fix is to go to the [[Options window - General Panel]] and click the "Restore to Default" button, explained in [[How to set the home page]].