Firefox 91 has HTTPS enabled by default in private browsing mode
The Firefox 91 browser, released on August 10, includes HTTPS by default in private browsing mode.

Monday — Friday:
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Monday — Friday:
9:00 - 18:00 CET time
24/7
The Firefox 91 browser, released on August 10, includes HTTPS by default in private browsing mode.
The CA/B Forum, the SSL certificates regulator, has decided to drop the subject:organizationalUnitName field because previous attempts to tighten its validation have been unsuccessful.
As a result of additional checks, the CA/B Forum found that section 3.2.2.8 of the current rules for issuing SSL certificates (Baseline Requirements) contains security holes related to CAA verification.
The CA/B Forum recently approved Ballot SC45 to address security holes in methods 3.2.2.4.6, 3.2.2.4.18 and 3.2.2.4.19 of the Baseline Requirements*.
Starting from 27 May 2021, DigiCert Code Signing certificates will require 3072-bit RSA keys or higher to issue Code Signing certificates.