Zend certified PHP/Magento developer

Youtube videos cyclic quality spikes

I have a home computer with windows 10 and a Firefox browser, and I’m annoyed with an issue there: cyclic quality spikes: when watching videos with good resolutions, around 720p, I’m getting cyclic quality spikes: visually the bandwidth/quality significally drops (the picture becomes “squared”), I get sudden picture degrading for around 0.5 seconds, then it restores back to normal; this happens in a period of 5-6 seconds, and for some reason only for videos that shows travelling – i.e., for instance, when someone is riding a car or motorcycle with a dashcam; still videos when there’s not so much changing between frames are just fine. This issue persists across all of the Firefox versions for last couple of years, isn’t present when watching same videos in Chrome on the same computer, and of course Firefox on another machines shows it just fine. First I was thinking it’s a problem of a certain videos, but then realized it’s a given browser instance issue. This computer I’m talking about has the hardware capabilities that certainly fit the hardware rendering: a modern CPU, 16 gigs of RAM, GTX 1070 board. So…

How can I can get rid of it ? I doubt the codecs have anything to do with the FF profile, so I didn’t try to wipe it.