A lot of websites are still not 100% working with Firefox and I keep the IE installed, just in case (hard to remove it anyhow ), but I setup Firefox to be my standard browser and have not missed anything yet.
Read here, where to download it.
The real power of Firefox reveals after you got some extensions installed:
- Customize Google: Enhances your search on Google with numbering and additional search links
- Google Toolbar: your status and connection to google
- ShowIP: instantly do a lookup of the registrant of a site and see, on which IP the domain is hosted
There are a lot of good extensions for that neat browser and I can only recommend to use it!