Until recently it was good. Since yesterday it went crazy causing not only browser, but the whole PC to behave strangely - like a virus - putting mouse in some fill-in areas to appear endless zeroes, freezing videos and PC crash. I've disabled it, and all that is gone. Stay away from this addon - it is malicious!

Only feature I wanted was to display more vid thumbnails as Youtube has reduced them to 3. Youtube is so STUPID!! This does not overcome the default formatting limiting the display. After install and several page refreshes 6 place holders display in gray for a split second....then loads the restricted giant 3.
Update: I believe I did enable the "Custom Rich Grid Layout"....can't say with 100% certainty. But I can say I installed a different add on, selected 6 wide for my grid and refreshed Youtube and it worked 1st time. No extra steps, no hidden toggles, etc. You may have a great add on....but spending hours or days trying different "features" to achieve my needed result is not time I'm willing to spend. If enabling another toggle is required you should have them linked or noted.

Good when it works, but half of the time it just doesn't.

needed the only function but it was payware

No hotkey for pause.

Shortcut of adding video to playlist does not work!

As of today, it breaks the dark mode on youtube.