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Tons of features to improve your user experience on YouTube™.
A very lightweight add-on that allows you to watch YouTube™ videos using Flash® Player instead of the default HTML5 player. The Flash® Player will consume less CPU and RAM resources if your device doesn't easily support HTML5 videos. Try it!
YouTube Enhancer Plus is not compatible with Firefox Quantum, you should install Enhancer for YouTube™ instead.
Automatically play YouTube™ videos in HD or any other preferred format, and disable autoplay for videos loaded in background tabs.