Mozilla Firefox keep developing their browser, after successfull release of firefox 4, now releasing new firefox 5 beta version for advanced browsing experience with ultimate performance and added developer support version.
According to the release plan, Firefox 5 final is scheduled for release in the week of June 29, while the first stable experimental release of the browser with an actual 5.0 version number should be available in the week of April 13. The expected interface changes, which will include the web application tabs, will not land until early may, however.
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