am running Firefox 91.11.0esr and intentionally MITM'ing myself with Fiddler Proxy, and it works on websites not using HSTS, but breaks on HSTS sites. How can i tell firefox to ignore HSTS? googling suggest going to about:settings and setting
security.mixed_content.use_hstsc=false
but that seems to make no difference. (perhaps an old config option which was removed/renamed at some point?)
related question: how to ignore HSTS on Chrome?
