[Lilux-help] Installing/using Firefox

Hi, I went on the website, downloaded the firefox installer and "installed" it (as root) but my other users can't use it. For some reason, it won't start. It did work when I ran it as the user who installed it (root). I'd like to know the following things in general: - do I need to be logged in as root to install firefox on my system? - if not, should be logged in as root to install firefox on my system? - where should I install firefox? in /usr/local/bin/? in /opt/ ? - there are three different users on my system, what should I do to make sure they all can use firefox once it's installed? About my specific problem, I launched firefox from the shell and got the following error message: <quote> user@host:~> firefox Xlib: connection to ":0.0" refused by server Xlib: XDM authorization key matches an existing client! (firefox-bin:5584): Gtk-WARNING **: cannot open display: </quote> thanks for any help Serge -- ---------------------------------------------------------------------- Serge Marelli, Luxembourg E-mail : serge.marelli(a)linux.lu ---------------------------------------------------------------------- LiLux - http://www.lilux.lu/ Defending Innovation against Patent Inflation http://swpat.ffii.org/ Free Software Foundation - http//www.fsf.org/