Install Firefox 3 Beta 4 in Ubuntu with One Command - update

This post is an update to my previous instructions for Firefox 3 Beta 3.
Mozilla Firefox Beta 4 was released on Monday, March 10th. Want to try it out today in Ubuntu? Here’s an easy one line command that will install it in Ubuntu (or another Linux distribution) alongside your existing Firefox. Please note: the Firefox 3 Beta 4 release is intended for testing purposes only.

Backup your profile
Before you run Firefox, you may want to backup your profile from Firefox 2. I haven’t had any problems sharing the profile so far, but don’t let Firefox 3 update update your extensions when it starts to avoid incompatibilities. This command will backup the Firefox profiles folder to firefox_profile_backup in your home folder:
cp -r ~/.mozilla/firefox/ ~/firefox_profile_backup

If you need to restore from the backup, do so by replacing the hidden .mozilla/firefox folder with your backup.

Install Firefox 3 Beta 4