It kinda stopped by itself like halfway through a video and I have no clue why. Maybe it was something on YouTube's end?

Same thing in Safe Mode and a fresh test profile?

This is a YT issue it seems - happens on a channel I watch often for the first few hours after upload, and then fixes itself later. The videos get a bunch of comments about it during that time, then nothing.

I've got a 1080ti, i7 7700k, and 16GB of RAM. When watching YouTube videos, it'll occasionally flicker to the thumbnail of the video I'm watching for like 1 frame, and this happens in both full screen and windowed. Oddly enough, this only happens with YouTube, not Netflix. I've tried both hardware acceleration on and off, and [this](https://www.reddit.com/r/firefox/comments/76bzmi/possible_solution_to_choppy_1080p_60_fps_youtube/) whatever it's supposed to do.

YouTube videos flicker to thumbnail