Are you running 64 bit or 32 bit Ubuntu LTS?
How does your OS reach when using a standalone prebuilt binary of firefox? Try it out by doing the following command sequence. Open a terminal and type them in there.
Code:
wget http://download.mozilla.org/?product=firefox-3.6.8&os=linux&lang=en-US
#Install Firefox
sudo bash
mv ./firefox-3.6.8.tar.bz2 /opt/
cd /opt
tar -xf ./firefox-3.6.8.tar.bz2
chmod 755 /opt/firefox/firefox
#Launch Firefox
/opt/firefox/firefox
Does your computer still freeze? If you don't want it when you're done then you can uninstall it with the following commands...
Code:
sudo bash
rm /opt/firefox-3.6.8.tar.bz2
rm -rf /opt/firefox
If you decide you like this version of firefox you can replace the command with the opt version of firefox like so...
Code:
sudo bash
rm /usr/bin/firefox
ln -s /opt/firefox/firefox /usr/bin/firefox