extensions.webextensions.restrictedDomains should support wildcards (or automatically exclude all subdomains)

[mawy]

I have added my banking site and github to extensions.webextensions.restrictedDomains, to ensure a rouge extension cannot steal sessions cookies from there. Unfortunately I have discovered that when I use a subdomain (gist.github.com), firefox will happily give the extensions access to my sessions cookies. This seems like an oversight. I believe it should restrict all subdomains on a site or at least allow wildcards, to properly lock down firefox, like *.github.com.

Would also be cool if you could explicitly blacklist and whitelist certain sites on a global or per extension basis. Especially since extensions now have 1000s of dependencies and are increasingly becoming an attack vector.

[Jon]

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