This add-on is still working on my Firefox now(Feb~Dec-2023).
On some version of Firefox, You must maybe settings(Option or "about:config").
Please read more about this add-on page.
After add this Extension, YouTube Videos became not pause. Thanks!

2023/12/2 P.S.
If playlist still pauses, some settings may be incorrect.
First make sure the version is "0.9.2".
In some versions, turning on the permission switches of accessing youtube.com for may work (Manage Extensions).
The developer's email is presenting on the ADD-ONS' page now.
Take a good look.

Works like a charm, Thank you for making this!

Flawlessly does what its designed to do. Thanks to the devs.

works well. I like to turn off my ad blocker and run my favorite channel all day on a loop for up to 12 hours.

It doesnt work anymore youtube still stops playing

God bless this extension's creator! I play therapy music for my dogs when I'm out, so this lets it play without interruption. My pups thank you too!! I haven't taught them to click "yes" (yet!)