WebExtensions could use popups and panels in the extension UI to load an "about:" privileged URL, violating security checks that disallow this behavior. This vulnerability affects Firefox < 56.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-7816.json"
[ { "events": [ { "introduced": "0" }, { "last_affected": "55.0.3" } ] } ]