Disable HSTS thusly https://campus.barracuda.com/product/ContentShield/doc/73699516/how-to-clear-the-hsts-cache-or-disable-hsts-for-firefox/
Disable HSTS thusly https://campus.barracuda.com/product/ContentShield/doc/73699516/how-to-clear-the-hsts-cache-or-disable-hsts-for-firefox/