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Hello, I know nothing about editing CSS or I'd do it myself but sadly I don't know how. The new version of youtube was officially forced on all its users today and this is the biggest thing I can't find a replacement for. I just want the header/search bar to stay at the top when I scroll down instead of being stickied to the top of the page.
I would also love a script that makes videos in theater-mode take up the full width of the screen but I'm assuming that would be more difficult to do.