Did you check the home page setting? *https://support.mozilla.com/kb/How+to+set+the+home+page *http://kb.mozillazine.org/Preferences_not_saved ---- You can open the <b>about:config</b> page via the location bar and do a search for <i>yourcursor</i> via the Filter at the top of the about:config page.<br /> You can reset all <i>yourcursor</i> related prefs that appear bold (user set) via the right-click context menu to their default values. ---- It is 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