Mozilla has released its first release candidate, RC1, for Firefox 3.6 for Windows, Mac, and Linux.

The new version includes Personas, which lets people customize the browser's appearance; blocks third-party software from encroaching on its file system turf to increase stability; and perhaps most significantly given the competitive threat from Google Chrome, shortens start-up time and improves responsiveness and JavaScript performance.

Firefox 3.6 RC1 is also available from Mozilla's download site.

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