CNET have a review of the latest Firefox 2 browser, and in a comparison with IE7 say that Firefox 2’s Security and other features are better than what is being offered in the latest IE7 from Microsoft.
Some of the new features include the ability to arrange tabs when browing multiple sites, restore the state of tabs if the OS crashes, and reopen a tab if you accidentally close it. Live Titles is another new interesting feature which allows websites to send updates to your bookmarks (RSS for bookmarks?), so for example if you have a news website bookmarked, when you view your bookmark for this site it will display a summary of the latest headline from the site.