So, you are getting a little envious because Fedora 11 just came out and they have Firefox 3.5 Beta 4 installed by default. You want to test out the latest Firefox on your Ubuntu desktop. No worries. The following instruction details the steps necessary to install Firefox 3.5 on Ubuntu 9.04 Jaunty Jackalope.
1. Open up your current Firefox browser and get the Public Key for Firefox 3.5. Copy, Paste and Save the public key to a text file.
2. Open System > Administration > Software Sources. Click on the “Third-Party Software” tab and add the following source:
deb http://ppa.launchpad.net/fta/ppa/ubuntu jaunty main
3. Click the “Authentication” tab and import the key file that you saved on Step 1.
4. Open System > Administration > Synaptic Package Manager. Click the Reload button first, Search for “Firefox 3.5” and then Install.
5. After the install, you can run Firefox 3.5 by accessing Applications > Internet > Shiretoko Web Browser.
What’s the big deal with Firefox 3.5? The biggest feature is the Private Browsing Mode or anonymous browsing. This means that you’ll be able to browse websites with no history, no cookies, no visited pages, no search and form history, no saved passwords, no download list and no web cache files. Awesome.