Greasy Fork is available in English.
Automatically sets your Quality & Speed to your desired values, Auto Fullscreen, Auto Pause/Unpause when switching tabs, Auto Unmute, Auto Focus.
< HiAnime Auto 1080pについてのフィードバック
it seems like CSP on firefox is blocking the userscript from accessing the player's js (which obviously breaks the script).
sorry but i think thats a firefox limitation/bug/feature so i cant really fix it, at least not in a way that would be good for everyone.
so for starters i recommend trying other userscript injectors like greasemonkey, tampermonkey beta or violentmonkey and see if those fix your issue.
It just does not want to work in Firefox. I have tried everything using GPT's fixes and cannot get it to work.