Hello, could you provide some more details please? With the changes YouTube has made, when you say it doesn't do anything, were there any UI-elements un-rounded, just not as much as you expected, or did it look like nothing was changed at all? If there was nothing at all, did you right click and give it permissions for "All YouTube pages" or did you change any of the settings in the window? If you don't give it permissions for all YouTube pages it can't make any changes at all. Thank you, your feedback is appreciated so I know what to fix.

When you say "I" didn't do anything, does that include clicking and giving it permissions? For security reasons that is required to apply the changes. If you didn't do anything, then it wouldn't have access.