i'm not sure if it works, i feel like i need a visual guide to know what changes more than just the one screenshot

It all works fine again, except there's no youtube livestream chat.
There is a message
"Oh no! It looks like you're using an older version of your browser. Please update it to use live chat."

Would be nice, if you can fix this.
I'm using Firefox 77.0.1 newest Version ,64bit
Great Addon.

This extension is essential. Thank you!

- work like a charm
- pretty decent sourcecode without obfuscation
- only access to youtube.com domain
this is a 5/5 ! ;)

It's absolutely brilliant

it works and came up in a google search so good i guess

10/10
very well done sir :D

This addon fixes the YoutubeCenter script. Awesome!

:)

It works. Youtube already removed an account menu option to switch to old layout, and https://www.youtube.com/testtube doesn't work for me, so it is nice to have this addon instead

The new YouTube design is absolutely terrible and slow. Now YouTube removed the option to switch back to the old design. This great extension fixed it. Works without problems so far. Thank you very much! :-)

This is a godsend since Youtube officially removed the ability to switch back to the old layout. This preserved some of the add-ons I really needed to make Youtube more usable as each coming iteration of the site gets worse and worse.