I used to have a similar issue on my laptop. IE was the only browser capable of viewing YouTube videos at 1080p without stutter. Firefox would stutter, as would

I used to have a similar issue on my laptop. IE was the only browser capable of viewing YouTube videos at 1080p without stutter. Firefox would stutter, as would Chrome and Chromium Edge. I've since given the laptop a clear out, reinstalling Windows 10 and installing Kubuntu as well. The issue has now gone away. Firefox now copes fine from either OS.