This is from the Developers on Pateron from the 15th of august:

We would like to apologize to all supporters that this extension is currently not working. 😔

The reason is a technical innovation in the Google Chrome browser from version 127. 😟

With the Firefox browser you can continue to use version 3.5 of our extension, as Mozilla has not yet implemented this technical innovation. 😌

Unfortunately, important developers are currently on vacation to make the necessary adjustments. 🏖️

As soon as the core crew is back, a new version with some bug fixes and new features will be released. 🎁

With your donation you enable quick corrections and further developments of this extension. ❤️

We would be happy if you sent us your feedback to feedback@ms4yt.com. 📧

Thank you for your understanding. 🙏

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Sadly, as im writing this on september 1st 2024, The Extension doesn't work on Firefox.

I'm still giving it a 5 star review, its the least i can do since i cannot donate money atm.

Thanks to you, my YouTube Watch Later is finally organized! So easy to use and helpful. Kinda blows my mind that YouTube doesn't already let you do this.

funciona bien para limpiar duplicados y videos que ya viste, o eliminar videos por nombre de canal.lo unico malo es cuando intentas borrar mas de 500 videos se queda bloqueada la aplicacion por largo rato y consumiendo mucha memoria

People, find the patreon for this app and start donating SOMETHING or this app might whither. This is a killer app. I don't know how I existed before without this. The more you use it, the more you realize how useful it is. The name of it completely underplays what its actual power is. On August 8 2024 there seemed to be a problem after a Chrome update but it was still working, mostly but not always, at Firefox.

Turn the extension off when you aren't actively using it.

Worked perfectly until a few days ago.
Another youtube update probably broke the add-on and now i can't delete multiple videos other than on the watch later playlist

Update: Works again, just as before

I can clear my playlist in 3 clicks, strange YT took this feature away.

Most useful addon for selecting multiple videos, and clearing playlist! I would recommend this to anyone!

Works wonderfully and is simple to use, helped me clean up my huge playlists

i want to marry whoever created this extension. thanks dude/dudette :D

amazing piece of software. 5/5 unfortunately, supposedly due to Firefox limitations it can't save/export playlists with the .txt extension, but it will save as "empty" file.

GREAT ;) Thx

good. very gooddd. but on firefox the multiselect works but the three dot button to adddd to playlist no longer work :((((

This extension is really excellent. I had to get used to the new interface, but I now think it works better than the old one.

👍

The perfect extension for managing playlists on Youtube. Now I can finally easily remove all those half watched videos from the Watch Later list.