Absence of this feature makes it very difficult to alleviate concerns of people that approach me for recommendation of a browser only to find out that there's no scoping of permissions of extensions in Firefox to speak of.
I know that this has been tied into the Manifest V3 implementation, but that seems ages away whilst this very feature has been available in other browsers for years now.
Help us help others to move away from *other browsers* by giving them less reasons to worry about, please!