Powerful extension, however UI is buggy in Firefox version, stuff like mouse wheel for volume is not assignable in the shortcut section.
Often times need a full browser restart for functions to appear correctly.

Edit for Dev: I'm one of the people who reported it as a bug on github, however i also see that the extension hasn't been updated for Firefox for more than 6 months.
I wish I could make it a daily driver, but having to use Chromiums buggy JS integration has me coming back to Firefox.
Also please make mini player position assignable, so that its possible to not just have it in the top left corner. Scrolling to comments with the video in view is a godsent.
Unsure what creates the need for restarts, but i found that features just wouldn't change, might be my configuration, regardless it's been enough to avoid the features menu entirely