After finally giving in I decided to work out how to get Firefox 2.0.0.11 and 3.0.1 running side by side. It turned out to be much easier than I thought, so I thought I’d share this with the world (although its probably posted on about 5million other blogs), either way…

• Download Firefox 2.0.0.11 from OldVersion
• Change the installation directory to something other than the default

That’s the easy part, now for the more complex bit…

• Make sure all your Firefox windows are closed (yes, this one too)
• Start -> Run -> “firefox -ProfileManager“
• Press “Create Profile” and call the new profile “ff2“
• Once it’s created the profile press “Exit”

Now navigate to the folder you just installed Firefox 2 into, and create a shortcut to the firefox.exe

firefox.exe -P ff2 -no-remote

Put that wherever you please and then you can load Firefox 2 and 3 at the same time!