OK please help... this is driving me nuts! Over the last couple of days my FF sometimes opens - sometimes not. Presently I can't open it from anywhere! Trying to get help from FF is not easy....I thought maybe I'd just reinstall FF & hope things would right themselves, but when I run the setup it tells me I must close FF to be able to continue with the installation!! Similar comments come when I try to UNinstall the existing FF! Very frustrating!