I read an article about Firefox 1.1 Alpha that soon will be available from EWeek:
"The Mozilla Foundation is preparing to release the first alpha version of its next Firefox Web browser within the next few days. The release, called Deer Park Alpha 1, is targeted to Firefox's base of testers and will include developer-focused features such as support for additional Web standards, extensions improvements and a way to report incompatible Web pages, Mozilla officials said.
Deer Park also serves as a sneak peek into Mozilla's plans for the full Firefox upgrade, due for a broad public beta later this summer. Firefox 1.1 is slated to give users additional pop-up blocking tools and a more visible process for installing Firefox updates, including security fixes. The alpha release is built on the newest version of Mozilla's Gecko rendering engine that will provide a performance boost to Firefox as well as add support for such standards as CSS3 (Cascading Style Sheets Level 3) and SVG (Scalable Vector Graphics). For SVG, which is a next-generation method of rendering graphics on the Web, Firefox 1.1 is supporting a subset of the SVG Full 1.1 specification."
Finally, the long wait for a browser that implement and support CSS3 will be over (even though it's still on development and it will be partial support). At least, more website can be viewed with Firefox without having to install IEView extension.