It isn't all cohesive at Mozilla as there are some dissenters. One of those is the Firefox director, who says that the majority of their users are running Windows XP, and there's no easy way to determine how many of them would be left behind if such a move was made. He did, however, admit that following the release of Windows 7, if enough XP users migrate they would consider dropping support for the aging XP operating system.
There's no immediate action coming from Mozilla, but it is an important topic nevertheless. As one of the most well known and popular products out there, Firefox plays a big part in many people’s computing. Having only extended support from the OS vendor is one thing, but having none from your browser developer, when it is the most common entryway for any malicious activity, is another. If you are resistant to upgrading beyond Windows XP, would losing access to newer versions of programs be enough for you to reconsider?