Mozilla is pushing ahead with its open video support in the Firefox web browser. Current developer builds of Firefox 3.6, expected to arrive later this year, now include a fullscreen option for movies embedded using the HTML5 video tag.

Unfortunately, while the HTML5 spec provides a way to embed video without using plugins, it stops short of specifying a video codec — which means codec support will vary from browser to browser, making it difficult to embed a single video that will work everywhere.

While the Ogg Theora recommendation has been dropped from HTML5, some browser vendors, like Mozilla, still intend to support the Ogg Theora codecs. In fact, Firefox 3.5 already offers full support for embedding .ogg videos using the HTML5 video tag.

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