I installed Firefox 4,I also added a Persona, I was adjusting the navigation bars and the search bar.Now the problem is that the navigation bar is not visible,I have enabled it through the View option.But navigation bar is no where to be seen,even when i open new tabs,when I click in them,nothing happens.I cannot type anything in them.I have only the search bar enabled,which means I cannot open any webpage directly by typing its address.It is really irritating,I had no problems like this with the earlier version of Firefox.I have uninstalled the Firefox,deleted the program files and reinstalled,but the problem continues.So I would also like to know,how the Firefox remembers the settings even when I uninstalled and reinstalled it.