In your browser (e.g., Safari),
- Add a dummy bookmark and name it
Change playback speed (1.5x) - Change the URL of the bookmark to
javascript:(function()%7Bvar%20video%20%3D%20document.querySelector(%22video%22)%3B%20if%20(video)%20%7B%20video.playbackRate%20%3D%201.5%3B%20%7D%7D)()
On website playing a video, click 1.5x in your bookmarks.
1.5xjavascript:(function()%7Bvar%20video%20%3D%20document.querySelector(%22video%22)%3B%20if%20(video)%20%7B%20video.playbackRate%20%3D%201.5%3B%20%7D%7D)()
1.7xjavascript:(function()%7Bvar%20video%20%3D%20document.querySelector(%22video%22)%3B%20if%20(video)%20%7B%20video.playbackRate%20%3D%201.7%3B%20%7D%7D)()
2.0xjavascript:(function()%7Bvar%20video%20%3D%20document.querySelector(%22video%22)%3B%20if%20(video)%20%7B%20video.playbackRate%20%3D%202.0%3B%20%7D%7D)()