posted by Thom Holwerda on Tue 22nd Mar 2011 16:29 UTC, submitted by gogothebee
IconAfter a very long development phase, Mozilla has finally officially relased Firefox 4.0. The binaries were already up on the FTP sites yesterday, but today the release became official. Firefox 4.0 packs a heck of a lot of new features, including an entirely new user interface.

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).

The video is HTML5 video in WebM, which only works in browsers that support this open standard (Chrome, Firefox 4.0, and Opera 11). You can watch this video in Internet Explorer 9 using Google's Media Foundation codecs. You can always download the source file and play it in your favourite media player. Alternatively, you can watch the video in the closed H264 format at

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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