I'd like a way to easily specify exactly what sites an extension can run on. There are extensions that I'd like to run on a subset - often just one or two sites - without giving them access do anything else. For that matter, a way to only activate an extension as a one-off when I click it and on no other tabs.
What about container specific permissions? If they implemented that it would be enough for me since I tend to split up my services by type (eg: shopping, banking, work, hack) so enabling an extensive on a specific set of containers would rock. Right now I think the only control we have is over private tabs/windows?
I'm using an extension that does exactly that¹, actually every update of the extension is mostly about then supporting more websites and asking permission to access those.
So maybe more developers could do a all sites and manually select sites option?
¹BPC extension
The extension can declare which websites it can access, but the other commenter was looking for the ability for the user to declare which websites it can access.