Background is glitching

Sorry I cannot use Github because it’s one of the filtered sites in my web blocking.


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I’ve been facing this issue since yesterday or the day before yesterday, the background looks weirded out. I think I have also seen a blue color. This does not happen on my other computer, and my other computer has really bad specs so I would expect issues there and not on this gaming laptop from 2019.
Firefox browser.
I tried clearing cookies for this site, restarting PC, clearing ‘‘cached web content’’. No effect. I currently cannot try other browsers due to my blocking rules but I am really surprised this happens with something that does not run as a program on my pc but * noob terms* gets loaded from the internet.
It’s pretty much unplayable right now, it’s awfully ugly to look at.
I would really appreciate any help here