Mixed content blocking of insecure (HTTP) sub-resources in a secure (HTTPS) document was not correctly applied for resources that redirect from HTTPS to HTTP, allowing content that should be blocked, such as scripts, to be loaded on a page. This vulnerability affects Firefox < 57.
https://www.mozilla.org/security/advisories/mfsa2017-24/
https://bugzilla.mozilla.org/show_bug.cgi?id=1402363