Greasy Fork is available in English.
Tells YouTube that your browser only supports videos at 30FPS or less, which switches all 60FPS videos to 30FPS and allows old computers to watch high-resolution videos without stutter!
< Feedback on Disable YouTube 60 FPS (Force 30 FPS)
Great script
I can confirm that this script works on the latest version of Microsoft Edge as of 05/19/18 this script is a life saver, I have a 60 dollar Windows tablet and it can't handle 60fps video that well and it also saves my battery life