Higher speeds than 2x. I usually watch at 3x and sometimes more (sometimes with captions turned on). Keyboard shortcuts as well, as others have mentioned.

SponsorBlock specifically blocks sponsor segments in YT videos.

RIP the Ad Accelerator, which would up the speed upon detection of an ad. Youtube has found a way around it and it no longer works.

https://github.com/rkk3/ad-accelerator

with youtube enhancer (there's also an open source one i wanted to check out but haven't yet) f.e. one can add a speed icon in interface on which the scroll wheel works, allowing dynamic speed adjuistment which, accompanied with [cursor left] to jump back a bit and [number keys] to jump to 0-90% position is amazing for extracting info. Also, muting videos, turning on captions and rushing through them without the mindfsck is a soul saver often times. Our current attention economy with its commercialization incentives hopefully is just a toxic glitch in history..

Not the op but the extension I'm using adds 3 very mportant features :

* default to my preferred speed (2×)

* keyboard shortcuts to change speed on the fly as needed

* arbitrary speeds up to 4×