Currently you can view basic subtitles in Mozilla's Nightly builds. The basic WebVTT tags such as <b>, <u>, and <i> are working.
To try it out, go to [[enter '''about:config]] ''' in the address bar and set the ''media.webvtt.enabled'' pref to '''true'''. Then visit a demo page like [[http://people.mozilla.org/~rgiles/2013/demo.html this one]].
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