Read Why you should change to Firefox and step up and accept the 5 Day Firefox Challenge! Here's the challenge:
Firefox will import your bookmarks from Internet Explorer.
A Google search box is built in. And if you miss the full toolbar, download a Firefox version of the Google Toolbar.
Use the Tabbed Browsing functionality. Watch your productivity improve.
Play with Firefox. Get to know it. Have fun with it. If after 5 days, you're not completely convinced, feel free to switch back. There's not really any risk.
Are you ready to take this challenge? ;-)