Rather than offering a release candidate as had been expected, Mozilla this week released a preview of its upcoming Firefox 3.5 browser, adding fixes to bugs and the browser's JavaScript engine as well as improvements for video and audio playback.

Firefox 3.5 Preview will be offered to the 800,000-plus users of FireFox 3.5 Beta, with Mozilla looking for developer testing and community feedback. Although not a release candidate, the preview is considered stable enough for daily browsing use, Mozilla said. Testing has not been completed to the point where the software could be declared a release candidate.

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