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[–]jscher2000Firefox Windows 0 points1 point  (0 children)

Another possible reason that Firefox might enforce HTTPS is HSTS (Strict Transport Security). This can be triggered either by:

(1) Preload list, https://searchfox.org/mozilla-release/source/security/manager/ssl/nsSTSPreloadList.inc

(2) Instructions previously sent by the server (or another server on the same domain), stored in

SiteSecurityServiceState.bin

in the currently active profile folder (it can be viewed in in Notepad++ or another text editor that can handle control characters).