A security issue has been found in Firefox versions prior to 63.0, where by rewriting the Host request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted.
A security issue has been found in Firefox versions prior to 63.0, where by rewriting the Host request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted.
https://www.mozilla.org/en-US/security/advisories/mfsa2018-26/#CVE-2018-12395 https://bugzilla.mozilla.org/show_bug.cgi?id=1467523
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