cd ~/Desktop && sudo tar xf firefox-3.0a7pre.en-us.linux-I686.tar.bz2 -C /opt && sudo ln -s /opt/firefox/firefox /usr/bin/firefoxalpha && sudo sed '/Name/s/Firefox/Firefox Alpha/' /usr/share/applications/firefox.desktop | sudo tee /usr/share/applications/firefoxalpha.desktop && sudo sed '/Exec/s/firefox/firefoxalpha/' -i /usr/share/applications/firefoxalpha.desktop