@Sunny I've seen this before in Firefox on Win10. Did not happen in Chrome. Does not happen in Firefox on Linux. It didn't used to happen in Firefox on Win10, but I can't tell you at what point it started (within two years). Tried various things, but never tracked down the cause.
LibreWolf
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Yeah I've never seen this in any other browser myself - only with Librewolf. Am thinking its some sort of privacy/fingerprinting issue maaaybe? Just guessing.
privacy.resistFingerprinting in about:config.
It does a lot of things, including messing with canvas & webgl which causes these glitches on some websites.
I guess Librewolf enables it by default.
This is the cause. Your should be able to override it on a per site basis via the shield button in the address bar.
Yeah and I wish it was easier to disable. I nearly ditched LibreWolf again because it breaks so many websites and there is no clear explanation why and you can't turn it off in the normal settings menu.
Yup that was it! Thanks a bunch :)