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This method was previously non-threadsafe due to it needing to access dynamic URI flags. These flags were used to check the WEbExtensionPolicy to see if the webextension resource being loaded should be accessible. Making dynamic URI flags available off-main-thread in general would unfortunately be quite difficult, due to some of them depending on things like JS `nsIAboutModule` implementations, so that was not the approach taken. Instead, all information required is already available in the threadsafe WebExtensionPolicyCore, which is now directly queried, instead of being queried indirectly through protocol flags. Differential Revision: https://phabricator.services.mozilla.com/D215026