HTML5 video provides native APIs to accelerate playback of any video, but most implemented players either hide or limit this functionality. This extension fixes that, plus more...
Firefox version of HTML5 Video Speed Control
its playback button may Block view on small video screen
Faster Video for Firefox for Desktop that allows one to manipulate the playback rate of HTML5 videos. While right-clicking on a video allows one to change the playback rate to either 1.5X or 2.0X, this addon gives more control.
modify HTML5 video speed, and no UI required, using context menu to change speed
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