Firefox Supports XSL?

So I wanted to view the RSS feed that I have set for Visual Studio to load on start up, and when I browsed to the URL, I got a nicely formatted presentation of the RSS feed. "Wha??", I exclaimed. A peak at the source for the RSS feed revealed that Microsoft was including an XSL to "pretty" the RSS (you know, so if you browsed to it in IE, you'd get a real view since IE supports XML/XSL).

Interesting....

(or maybe, I'm just really behind things...)