One feature I liked is the session recovery, when your system or firefox crashes you can restore the websites that you have opened. There is also an undo close tab function. Now you don't need to install extensions for these features. Spell check is very useful, anti phishing may not block all the phishing sites, but it is still useful. Now with IE 7 and FF 2.0 having a phish filter, I guess those 3rd parties anti-phishing toolbars may disappear soon.