Clarify ambiguous statements in permissions.contains()

[rebloor]

MDN URL

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/permissions/contains

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

The statement "The promise is fulfilled with true only if all the extension currently has all the given permissions." is unclear.

What did you expect to see?

A clear statement of behavior.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response