Can't seem to catch it "on camera", so I'll have to do my best to describe it. When hovering over a canvas element on a certain site, the cursor is meant to change from your system default to a custom one. When doing so, the cursor briefly (blink-and-you'll-miss-it) shows a larger, glitchier version of the custom cursor, and then fixes itself and changes to the custom cursor as expected. I reported it to the admins of the site, who tell me it might be something to do with my GPU. I've tried disabling hardware acceleration, I've tried clearing my startup cache, I've refreshed Firefox, I've ran in safe/troubleshooting mode (in case it was any of my add ons - it was not!), i've updated my BIOS and graphics card (Firefox is up-to-date). I've restarted Firefox itself multiple times. It does not happen in my other installed browser (Brave). I also cleared my cache for that site to no avail. The only way it seemed to fix was when I ran OBS (recording/streaming program) and tried to record it. I don't know what it did, but it came back when I stopped recording.