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Mozilla Firefox 38.0 Will Bring True HTML5 YouTube Playback on OS X and Linux, Tab-Based Preferences Page, Reading List

Another feature we want to mention here is the full support for HD HTML5 playback on YouTube for the Linux and OS X operating systems. As you might know, Mozilla Firefox 37.0 allows HD HTML5 playback on YouTube up to 720p on the aforementioned OSes, so the Beta version of the acclaimed web browser now allows you to play even 4K video clips on YouTube using the HTML5 web technology.