How can I completely uninstall Firefox, then re-install? My brothers Firefox icon is just blank for some reason on the Unity sidebar. It launches but the icon is completely blank nothing there. If I uninstall this for him and then re-install will it work? Please help. I want to get this fixed for him.
First try moving his profile data out of the way, it may be corrupted. One easy way to do it is to rename the .mozilla directory, on a terminal:
mv ~/.mozilla ~/mozilla-backup
When you restart Firefox it will rebuild a new profile.
If you want to completely wipe out and reinstall firefox, on the terminal do this:
sudo apt-get purge firefox firefox-globalmenu firefox-gnome-support
This will remove all traces of the Firefox system files. Then, to reinstall:
sudo apt-get install firefox firefox-globalmenu firefox-gnome-support
You can reinstall firefox with the following command:
sudo apt-get install --reinstall firefox
If that doesn't help, see http://ubuntuforums.org/showthread.php?t=1898600