Audit extensions.webextensions.restrictedDomains again

extensions.webextensions.restrictedDomains was the result of Bug 1453988 and related (#26114 (closed) for us).

Its description in 001-base-profile.js says Allow NoScript to access addons.mozilla.org etc., but @ma1 said that he thinks that we could do something better, too.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information