How to make Firefox buffer/preload full videos (HTML5)

Open about:config. Set media.mediasource.enabled to false. Some sites use Mediasource, a web standard that allows to load videos in chunks. It can be disabled as selayang said, but that’s not all. Firefox uses the following prefs to buffer only part of a video:media.cache_readahead_limit, which determines how many seconds of the video need to be downloadedmedia.cache_resume_threshold, …

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