Mozilla Labs have come out with an interesting approach to Firefox browsing experience and interface.
You can try it now with Firefox 4. All you have to do is download the Mozilla Labs: Prospector - LessChrome HD add-on.
Remember that the latest Chromium 13 build was heading the same way?
Well, the omnipresent url bar is coming to an end. I personally like what both Firefox and Google are doing. Less clutter, more web. Doesn't that sound familiar? Hum...ChromeOS, anyone?