If I read it correctly, it's in Chrome since the middle of 2018: https://www.ssl2buy.com/wiki/google-will-start-enforcing-certificate-transparency-chrome-68 ht

If I read it correctly, it's in Chrome since the middle of 2018: https://www.ssl2buy.com/wiki/google-will-start-enforcing-certificate-transparency-chrome-68 https://www.ssl2buy.com/wiki/google-will-start-enforcing-cer... In that context, reading the already mentioned Firefox bugzilla communication is even more interesting: https://www.ssl2buy.com/wiki/google-will-start-enforcing-certificate-transparency-chrome-68 https://www.ssl2buy.com/wiki/google-will-start-enforcing-cer... It seems Firefox implementing it or not doesn't change much, in this case, due to its low matket share.