I just wanted to both report the issues and double check with anyone else potentially experiencing the issue.

Problem: On high refresh rate monitors (mine is 240hz) I begin to see issues when scrolling and viewing videos. It's not necessarily screen tearing (I think) but it's especially prominent on YouTube where elements of the video appear across the whole screen in flashes as the video is playing. I've moved the browser to other monitors that are 60hz and the flashing disappeared. I even tried on incognito mode and it still appears. I've restarted the browser and even my computer but the issue persist. I've even tried other browsers but the issues is only on Firefox.