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How do I completely remove this? I already removed the script and even uninstalled Greasemonkey and I get this (see attached screenshots) whenever I load a video. I only used this script on Firefox, but this is also happening now on Chrome, so it did something to my YouTube account, which makes no sense but alright.

The page not rendering / rendering incorrectly even happens on other pages like Subscriptions, Account Settings, etc.

Try clearing the webpage cookies. I haven't tested the script on Firefox, I'll have to look soon.

I tried doing that first before the more drastic steps. Like I said, the same thing is happening on Chrome now, even though I didn't install the userscript on Chrome. I only installed it on Firefox. It's not happening in Edge.

When the page loads "blank" like that... if I leave the tab open for maybe like 10 min or so, it eventually loads the full page.

I'm not sure what is happening. The script doesn't store any cookies, data, or modify any HTTP data.

Let me know if a day of rest fixed anything. It might just be a server issue.