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If you're using a newer version of FireFox, your browser can play HTML5 video. However, FireFox is an open source project they were unable to provide support for the propritary H.264/ .MP4 video format. You can sitll play these videos by installing flash.
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Another tour-de-force turn as ‘Al Weaver from Johnson’s Wax’ in the “Chinese Wall” episode of Mad Men.