Firefox Always Crashes in Ubuntu

Recently Firefox always crashes in my Ubuntu box. By looking at the crash report I noticed that add-ons might have something to do with the crash. However, the problem is still there after removing/disabling all add-ons. I even tried to update Firefox, that does not solve the problem neither. I then tried remove all contents related to Firefox and reinstalled it, and it seems fix the problem for me.

sudo apt-get --purge remove firefox
rm -rf ~/.mozilla/firefox/
sudo rm -rf  /usr/lib/firefox*
sudo apt-get install firefox