Check Mozilla support.

Access your data for all websites

The extension could read the content of any web page you visit, as well as data you enter into those web pages, such as usernames and passwords.

As mentioned by others, requires access to all websites when just youtube would be fine. And it does not work on Android at all.

Although being featured for Android, it doesn't work there.

Asking for access to all websites is too broad, considering only YouTube would be required.

We need a replacement for this for Android.

Hasn't worked for months now and won't update to new virsion even after uninstalling

This addon is a major security issue requiring access to data for ALL websites instead of just youtube. Dont trust it as there is absolutely no reason for that. Theres enhancer for youtube which does the same thing and more and only needs access to data on youtube in order to function correctly. Avoid!

Auto-pause does not work on Firefox Android. Neither stable nor Nightly. This Add-on is recommended for Firefox on Android

Why giving access for all sites is required? Autopause does not work. Breaks video.

---TO THE DEVELOPER:
The Auto Pause feature for playlist does not work at all!

Here are all my settings:
---Video Quality
Set to: 4K 2160p
---Video Size
Set to: Expand
---Video Speed
Set to: Normal
---Volume
Set to: 50
---Auto Play.
Both options set to: Auto Pause
---Embedded Video
Option set to: Auto Pause
---Auto Subtitles/Closed Captions (CC)
Option set to: Default
---Generic
Option: ticked

Example? Try "The Winner Takes It All ABBA (Piano Cover) Ulrika A. Rosén, piano. - YouTube" at https://www.youtube.com/watch?v=8-jGwK8qxBU&list=RDNN4iln3hHcc&index=1

Thanks to the developer for this add-on.

Hopefully, you will be to sort out why the auto pause does not work with a playlist.

No need to access data for all websites.

more like, YouTube Low Definition

Installed it on Firefox on Android and it failed to stop autoplay. I did set it to auto pause everywhere I could, but it didn't work.

Unreasonable permissions concerning user data completely unrelated to what it's supposed to do.
Worked just fine until it asked for access it doesn't need to function (Access your data for all websites).

Hope no one install that trash.

clips youtube videos at the top and need to scroll, highly irritating

Messed up fullscreen videos for me.