Out of all YouTube related add-ons, I think this is the most useful one.
Still, if it were possible, I'd give Enhancer for YT 4.8 stars instead of 5, just because of the problem within add-on: *reverse playlist does not work* .
Also, on the "Settings" page, a "save (settings)" button would be appreciated, simply as a peace-of-mind button, i.e. insuring that changes were really saved... but only if it wouldn't be much hassle to make it happen. It's not that big a deal.
I could come up with plenty ideas for features that might fit nicely with EfYT, (say a button sorting comments from the oldest to the newest one... and more), but according to review guidelines I'm not supposed to ask for any, so I won't. In any case, thanks for this lovely add-on.

It never saves my settings.

Reverse playlist doesn't work anymore.

works great! No bugs, great interface!

A surprisingly good YouTube add-on!

---TO THE DEVELOPER:
---20/10/2023. PROBLEM: THIS ADDON DOES NOT WORK ON YOUTUBE TODAY ON ANY OF THE VIDEOS THAT I WATCHED!
IN OTHER WORDS, IT IS LIKE I WOULD NOT HAVE THIS ADDON ENABLED WITH FIREFOX ON YOUTUBE!

---16/10/2023. PROBLEM: AUTOMATICALLY EXPAND THE VIDEOS DESCRIPTIONS DOES NOT WORK ANYMORE EVEN THOUGH IT IS TICKED!!!

WOULD YOU MIND ADDING A BUTTON TO STEP FORWARD OR STEP BACKWARD THE YOUTUBE VIDEO. LIKE IT EXISTS FOR THE VLC MEDIA PLAYER.
THANKS.

---23/08/2023: FOR THE DEVELOPER.
A problem appeared around 23/08/2023.
The title of the video goes into the area of the video screen causing confusion. As a result, I cannot even slide anymore the slider of the video!!! It happens when my video area is in theater mode.
This problem seems to have been corrected. So back to 5 stars. Thanks to the developer.

---FOR MAXIME RF THE DEVELOPER:
WOULD YOU MIND ADDED THE FEATURE OF BEING ABLE TO ROTATE A VERTICAL VIDEO THAT SHOULD BE SEEN HORIZONTALLY INSTEAD.
EXAMPLE: "(Piano Version) • Spaceman - Sam Ryder @Sam Ryder - YouTube" AT https://www.youtube.com/watch?v=uNPS5dGjKJQ

---18/05/2023: The big problem I mentioned on 25/01/2023 seems to have been corrected because this addon now works fine, as intended. So I put back the 5 stars.
Thanks to the developer for this addon.

---25/01/2023: BIG PROBLEM. EACH TIME I CLICK ON THE VIDEO, IT CHANGES TO FULL SCREEN INSTEAD OF STOPPING THE VIDEO.
I TRIED THE SAME IN MS EDGE WHERE I DO NOT HAVE THIS ADDON AND IT DID NOT HAVE THIS BUG THAT IS CAUSED BY THIS SPECIFIC ADDON.

It adds useful features to youtube. For example, toggle, decreasing or increasing the playback, and other features.

Suggestion: You could allow a change slightly in the darkness of the icons that are below the youtube window when one of these icons is in use.

Many thanks to the developer for this excellent addon.