Quote from gnome:
You'll need to keep IE7 on your machine. FF3 does not render some sites correctly.
FF3 has an add-on, "IE Tab", which lets you change the rendering to IE with a click.
1) In my experience sites that have problems rendering correctly in FF aren't worth your visit anyway; they have lousy webdesign and a lousy business model as well. Doing business there will often spell trouble.
2) IE 8 will adhere to the same webstandards that FF already does for years. This means that many many website that were designed for IE won't work in IE anymore. A lot of very costly rewrites will be needed, the price of not listening to warning about not complying to open standards. Maybe they will learn a lesson or 2.
3) I agree that FF now has become so good that it will even render most IE stuff reasonably well too, and with the help of IE Tab the last 1% is included as well
4) FF works on all platforms, Win, Mac, Linux and most other Unixes. This is a huge advantage when mixed platforms are in use, both in training, compliance and maintenance. In my home office I have several systems, some XP, some Linux. I use FF on all of them and they share their bookmarks through the Foxmarks server.
5) It is well known (and doensnt need explicit linking) that FF is the better browser, both in terms of speed, memory usage and security. You can google it yourself. It also "just works" out of the box. And most important, it is a separate piece of software, not a enormous bloat intertwined with your OS in ways too complex for mere mortals to comprehend.