Unfortunately it conflicts with "BlockTube", which is number 2 priority addon for me for youtube (3 is being SponsorBlock), so i have to disable it for now. But otherwise it's pretty good so far.

Reply (12.07):
I think i mostly have the default settings, but to be fair, its kind of a little buggy addon by itself, and i never found any better alternative.
It did work ok 3-4 days before that (ignoring the thumbnail and general lag), but after that some videos just suddenly stopped playing altogether, and other ones break mid-play, and disabling "dearrow" instantly stopped all of it.