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I have been using older version that is 3.6.13 of Mozilla. I just want to know about new version that is 4.0 Beta & its features from development point of view.

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Are you asking for the point of view of "developers who create web pages" or "developers who help to program Firefox itself"? – Doug Harris Dec 23 '10 at 15:29

Mozilla has a draft page (i.e. not complete but in progress) titled Firefox 4 for developers. The page includes detailed new features from the developer point of view.

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