Greasy Fork is available in English.
Allow to choose the default speed for specific YT channel
当前为
Inspired/Based by http://greasyfork.icu/en/scripts/30506-video-speed-buttons
The CSS is by another author which I couldn't find now.
You can change the default speed for all videos via the Tampermonkey menu options or on line 18 of the script. The default is 1x.
See the screenshot below and read it's description.
