Mozilla Firefox, Portable Edition Test Versions are test versions of the popular Firefox web browser or test versions of the Gecko layout engine bundled with a Launcher as a portable app that are being made available for testing purposes only, and are intended for web application developers and our testing community. For everyday use, please use Mozilla Firefox, Portable Edition.

Mozilla has just rolled out Beta 4 of its Firefox browser for Maemo and Android devices. Beta 4 promises to be noticeably faster, improve start-up and page load times and responsiveness to panning and zooming.

Also advertised is compatibility with 100 add-ons to customize the features, functionality and look of your Web experience. According to Mozilla, tests on JavaScript benchmarks show Firefox 4 Beta is faster than the stock Android browser; roughly three times faster on Kraken, about twice as fast on SunSpider and slightly faster on V8.

Other advancements in this release include increasing stability, reducing installation memory usage, improving readability with zooming, and fixing some keyboard issues. The latest beta is available to download from the Android Market and if you use a Nokia N900, visit this link to get downloading.