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The built-in video player (FF35.0.1; Windows Vista) does not play HTML5 videos (MP4). How can I disable it and use a different plug-in video player instead?

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config settings: media.directshow.enabled;true media.windows-media-foundation.enabled;true

several plug-in video players are installed but I am not offered to choose one of them. MP4-videos play well in them when downloaded before.

config settings: media.directshow.enabled;true media.windows-media-foundation.enabled;true several plug-in video players are installed but I am not offered to choose one of them. MP4-videos play well in them when downloaded before.