The speed department is probably where Firefox made the most important strides. Startup time - one of my personal pet peeves about Firefox vs. Chrome - has been improved greatly. For those of us who don't care about startup times, the more itneresting speed improvements come in the rendering of web pages, of course. Improvements in the JavaScript engine, as well as the introduction of hardware acceleration, makes sure of that.
The interface has been entirely redone and looks nothing like Firefox 3.x. It's not just skin-deep; new features have been added such as Panorama for easier tab management, searching for open tabs within the URL bar, and App Tabs, which allows you to pin websites as permanent tabs in your browsers (much like Chrome's 'pin' feature).
There's a lot more in Firefox 4, so I suggest you update your installation, or download the new version from Mozilla.



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