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Bro, you need to do something with youtube SPF, because it breaks your script on new polymer design and legacy design. Script frequently stop working and youtube show always 480p. Find the way to limit the spf.js functionality without destroying the page itself.
Here an example for legacy design (ONLY):
https://gf.qytechs.cn/en/scripts/16935-disable-spf-youtube

But this script use "unsafeWindow". Therefore, the use of this script poses a danger to users.

Can You make your own optional Youtube SPF Killswitch?

This problem is solved by adding to the hat a script // @run-at document-start. But I don't know how safe it is. Let the adisib say.