With Google slowing non-Chrome YouTube users, this is brilliant. Had noticed YouTube slowing but didn't know why - then found out and saw this recommended by Martin Brinkmann on ghacks.net, wow... instantly and noticeably faster. Thank you!

You are a king. I abhor the new site and the constant buffer and lag. Plus, the old design is a niche.

Thanks!

https://www.reddit.com/r/waterfox/comments/d79hqv/-/f14xknq/

– background: https://redd.it/d4xgb2

Downloaded this because it told me exactly what it did (adds disable_polymer) and it works fine. Wasn't having issues with Youtube's performance, just it's looks, and this fixes it.

Save my Lifetime! Works well!

Very useful. Thanks a lot!

As a feature suggestion:
If one could disable/enable it on page-level, that would be nice.
I need "disable_polymer=true" especially for other peoples playlists that I want to merge into my own playlists. The button is only available with polymer off.
For just viewing/listening to vids sometimes I like the new style. So switching dynamically by a hotkey or UI, would come in nice.

Does exactly what it says on the tin, no more, no less. Couldn't be happier.