To anyone thinking it was a good deed: please remember that later Google used similar techiniques against other browsers, like Opera. They showed a warning about an "unsupported browser" but if the user changed user-agent to Firefox or Chrome, everything worked. Another example is Web version of Skype which is very picky and doesn't work in many browsers, like mobile browsers, or slightly outdated Firefox. For exampl…
AFAIK Web Skype no longer works in any version of Firefox.