I use Maxthon (Formerly MyIE2)
Add all the cool features you want to IE, but better
Tabbed
Skinned
If you "kill" it. it remembers the last pages you had open
Popup blocking better than ANYthing I have seen
sidebars.. plugins.. RSS feeds etc.
Yes.. I know its an IE Wrapper.. but the features it adds are just to good.
I do Like Fx but the one thing that I think Maxthon beats it is
Mouse shortcuts:
want to go back a page: right click slide mouse to the left.. same as clicking back
refresh.. right click.. quick up / down...
etc
Drag drop new tabs.. Find a link, give it a quick drag and pop.. new tab!
not to mention.. didnt mean to close that tab!?? edit, undo close reopen whichever tab you want
and then there is the Boss key! (the best!) ALT+~ and poof! its gone.. COMPLETELY!
the only place you can find it is the Task manager Processes.. ALT+~ again.. its back!
just too many goodies...
http://www.maxthon.com/
If Fx add some more features.. and displays ALL webpages like IE (Yes, many that I have seen screw up) then I'll switch
my 2 cents.. ;)