Oh joy, Microsoft have managed to introduce security problems into Firefox through a plugin for it that they silently install without your knowledge! 🙁

Along with .NET Framework 3.5 SP1, Microsoft have been silently installing a Windows Presentation Foundation Plugin that allows the embedding of XAML applications (an XML-based UI technology) in web pages, called XBAP (XAML Web App). The exploit is drive-by, meaning that the victim only needs to be lured onto a web-page for the attack to be effective. The only safe thing to do until a patch is issued, is to open Firefox’s AddOn Manager and disable the WPF plugin.

Mozilla might already have reacted to this, my brother (who alerted me to the above story) said:

Firefox popped up saying it’s blocking 2 Microsoft add-ons so they must be cracking down on them

Dear Microsoft – please do not stuff about with peoples web browsers that don’t belong to you, you’re just not qualified..