You can check for problems with the localstore.rdf file. *http://kb.mozillazine.org/Corrupt_localstore.rdf *https://support.mozilla.org/kb/Toolbar+keeps+resetting Open the Customize window to see if the button is on a toolbar or in the toolbar palette. *View > Toolbars > Customize *Firefox > Options > Toolbar Layout *If missing items are in the toolbar palette then drag them back from the Customize window on the toolbar *If you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar set up ---- *http://kb.mozillazine.org/Toolbar_customization *https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing