Firefox: https://addons.mozilla.org/en-US/firefox/addon/videospeed/
Chrome: https://chrome.google.com/webstore/detail/video-speed-contro...
I watch all my videos at 2x speed now and I was shocked how much time I saved. It no longer takes me most of the night to work through my YouTube notifications, and has left me so much more time for project work during the week.
Firefox: https://addons.mozilla.org/en-US/firefox/addon/enhancer-for-...
Because there are other options like switching off one tab when you start video in another tab, overlay if you scroll down, default quality (I have to be on 144p because of bandwidth constraints)
You can go up to 16x speed and turn on captions to speed-read through
Really just depends on how much content the video has
example write in console: $('video').playbackRate = 3; (and playback rate would be 3x) Works with rates between 0.0625 - 16.0(tested in Chrome and FF).