Microsoft breaks HotMail for Linux users
linux-watch.com
linux-watch.com
Which is a fundamentally stupid thing to do.
This won't keep out IceWeasel users who actually understand the machine they are operating.
And motivations that you don't understand are not necessarily stupid. If you don't understand why it was important enough to the debian core team to bother with the effort of maintaining a forked version version of the browser; you are not able to comment intelligently on the topic.
Well recommending an upgrade isn't too bad... preventing users from accessing the site is just ludicrous.