While trying to find out the UI inspiration of Firefox 4, I said that though it has Opera like speed dial feature but it more towards organizing the Tabs into Groups.
Now each gets re sized automatically when you have a lot of them or when you do it purposely and when you take it to a level it’s too small, the Groups now displays all the tabs into stack like feature which is like Playing Cards kept on one other but a little twisted.
The best part is that you can actually pull each of them like you pull out card from the deck. If you don’t know Firefox has hardware acceleration so if you have touch screen you will actually love to play like I had played with it using mouse. Check out the video below.