Try to turn off the bar, then turn it on again. If this still happens, '''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]'''''.

Make sure that toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible. *Firefox menu button > Options *View > Toolbars (press F10 to display the hidden Menu bar) *Right-click empty toolbar area Use Toolbar Layout (Customize) to open the Customize window and set which toolbar items to display. *check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar *if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette into the Customize window to the Bookmarks Toolbar *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 setup *https://support.mozilla.org/kb/How+to+customize+the+toolbar *http://kb.mozillazine.org/Corrupt_localstore.rdf ---- There are other things that need your attention. Please update your plugins because some are outdated and have known security vulnerabilities. *http://www.mozilla.org/plugincheck/ Note that your System Details List shows multiple Flash plugins. # Shockwave Flash 12.0 r0 # Shockwave Flash 11.9 r900 # Shockwave Flash 11.3 r300 You can find the installation path of all plugins on the <b>about:plugins</b> page. You can check the Flash player installation folder for multiple Flash player plugins and remove all (older) version(s) of the plugin (NPSWF32) and (re)install the latest Flash player. *(32 bit Windows) C:\Windows\System32\Macromed\Flash\ *(64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\