Firefox 6 just made its way on my Ubuntu installation. That broke Capybara tests that use selenium-webdriver with the annoying unable to obtain stable firefox connection in 60 seconds error. Looks like support for Firefox 6 has just been committed and there’s nothing released. So hold your upgrades!

If you’re like me and just hit update, downgrading to an older version of Firefox is going to be non-trivial. The Firefox people make it super hard by hiding older versions and not versioning packages. They also make it particularly hard to run multiple versions, at least in my experience. I finally managed to go back to 3.6 with these instructions and in the process learned something about  apt-cache policy that can be tweaked to prefer distribution sources. Now, where can I find a distribution of Firefox 4 or 5 and how do I install it?