See these articles for some suggestions: * https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox * https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols * http://kb.mozillazine.org/Preferences_not_saved ---- It is also possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder. Delete the files sessionstore.js [2] and sessionstore.bak in the Firefox Profile Folder. * Help > Troubleshooting Information > Profile Directory: Open Containing Folder * http://kb.mozillazine.org/Profile_folder_-_Firefox If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.<br /> Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them). See also: * [1] http://kb.mozillazine.org/Session_Restore * [2] http://kb.mozillazine.org/sessionstore.js

Did you check the Home page setting to be sure that only one home page is set? *Tools > Options > General > Startup: Home page Did you check for problems with the file prefs.js? *http://kb.mozillazine.org/Preferences_not_saved *Help > Troubleshooting Information > Profile Directory: Open Containing Folder