The new tab switching behavior and interface was dropped at this beta, since the developer found it needed more work. Beta 2 was released on Decemand included a new private browsing feature. It included a new TraceMonkey JavaScript engine, which is not enabled by default, and the implementation of the W3C Geolocation API. On October 14, 2008, the first beta of Firefox 3.1 was released. Version 3.1 Alpha 2 was launched on September 5, 2008, implementing the HTML 5 video element support and preliminary support for web worker thread, enhancing the speed of some JavaScript computations. The Alpha release showed an 18% improvement in the Acid3 test over Firefox 3.0, scoring 84/100. The Gecko engine was updated to include CSS3 features and includes the HTML Canvas text API. The Awesomebar was also improved to have filtering by Bookmarks and history. When switching thumbnails are displayed so the user can preview the tabs before switching to them.
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