Functional. BUT please whitelist music.youtube.com domains or others which may not work well having a non 1x speed default.

Works as expected: fix video speed but you need to be on the Youtube tab.
I like the idea to have icon in the awesome bar, however I was expecting :
* to see it on every tabs, not just youtube, so I can change speed from anywhere
* that the value reflect current setting instead of a fix `3x`
* valid input using keyboard `Enter`

Improvement will be to have:
* keyboard accessible extension
* a quick way to set back to 1x speed

Simple, and can set with 1/10 step. That's what I need!
Thanks for plugin.