This is great and simple. I only don't give 5 starts because it would be handy an on/off option.

This does bring back the old yt layout but it cancels dark mode on yt and you can't enable dark mode while running this plug in.

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.