Great addon, thank you very much. Unfortunately, it fails to keep the non-polymer interface when refreshing a video page. A fix was to edit the "PREF" cookie and add "&f4=4000000&f5=30&f6=8" at the end.

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.