WebExtensions can use request redirection and a `filterReponseData` filter to bypass host permission settings to redirect network traffic and access content from a host for which they do not have explicit user permissions. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2018-11/#CVE-2018-5166
Acknowledgments: Name: the Mozilla project Upstream: Francois Lajeunesse Robert