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 latest version is "0.9.2".
In some version of Firefox, turning on the permission switches of accessing "youtube.com" for may work (Manage Extensions).

Works like a charm, Thank you for making this!

thank you!

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