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So, basically, it's a plain and simple rip off of firefox. Tabbed browsing? Took them long enough. A quaint lil search bar at the top right of the page? Reminds me of something... "Bubbly" look on the forward and back buttons? RSS feeds? Holy crap! Security? Don't count on it...
The only thing i see is perhaps the printing... but i mean, come on...
Is this what microsoft has to resort to? complete rip offs of everyone else's stuff to keep competing? Vista is a total rip of mac osx in t e appearance and "new features", and now IE 7 a rip off of firefox, opera and safari?
Besides, you can have IE Tabs open in ff if you need it..