[FlashBlaze]

I have tried regular as well as the developer version of Firefox, but no matter what I use, YouTube videos always skip frames after every 10-15 seconds or so. So I use Brave for YouTube and other WebGL heavy stuff and Firefox developer version for daily browsing.

[kiwijamo]

That sounds very strange. Certainly don't see that in Firefox on Mac (work laptop) and both Linux and Windows (personal laptop). Try adding the h.264 extension. That forces YouTube to provide h.264 videos which is hardware accelerated on pretty much any hardware.

[FlashBlaze]

Tried the addon. Still nothing. I have also tried clean installing Firefox with no addons, but same issue.

[behnamoh]

Adding that extension disables 4k video on YouTube.

[hojjat12000]

I don't know if you're on Linux. But I had issues with Youtube as well. Two things helped me an updated graphics driver and Wayland.

[FlashBlaze]

I'm on Windows 10 with latest drivers for Nvidia 1050Ti. Still the same issue.