If you Reset the Toolbars to Default Set, you will lose your Customization. And you you will have to Re-Customize the Toolbars to make them appear as before. So the solution for you will be to Create Separate Unique Firefox Profiles. Taken from https://support.mozilla.com/en-US/questions/851953#answer-217468 ''See Dealing with running multiple Profiles.'' ''http://forums.mozillazine.org/viewtopic.php?f=23&t=2249039'' ''Also these support articles:'' '' http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows'' '' http://kb.mozillazine.org/Shortcut_to_a_specific_profile'' '' http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox '' Taken from https://support.mozilla.com/en-US/questions/852505 the-Edmeister said: '' http://kb.mozillazine.org/Shortcut_to_a_specific_profile'' '' http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox'' ''I wouldn't get used to doing it that way, the Profile Manager as we know it today is slated to be removed from Firefox in the near future. No date or version has been set, but I would be surprised if it wasn't gone by the end of this year.'' Check and tell if its working.