This saves a lot of time for me, so it's greatly appreciated.
I know there is a shortcut ctrl+q to toggle the addon (which unfortunately overwrites the firefox close shortcut), but I also ask for a clickable toggle in the extension menu.
I don't like the multiselect toggle always being in the youtube page header since you only need it in playlist pages so I suggest it appears only when it is needed; but it could also be removed altogether and put into the extension menu instead.

Also the donate heart button is too flashy.
(Thank you to whoever commented that it can be removed with the Ublock Origin filter "www.youtube.com##[id^="msfy-donate-icon-"]")