FastVideo

Finds a video in the browser tab and sets the playback speed to 2. Always and without user intervention. Clicking on the extension icon sets the speed. The installation sequentially changes the speed 2 - 1 - 1.25 - 1.5 - 1.75 - 2 and so on around. In the settings, you can set the maximum value up to 6. But the icons are only for the first five speeds. On some sites where you need to click "play" video playback, the extension does not change the speed automatically - tracking greatly complicates the extension code and I have not finished handling such a case.