They will not load the site if the certificate does not have embedded SCTs. That's different.

They don't actually go check and compare the embedded SCT with what is in the logs. It would be incredibly slow to load the site if they did that.

This is going to blow your mind but they do, it's called the Inclusion Checking phase https://docs.google.com/document/d/1FP5J5Sfsg0OR9P4YT0q1dM02...

also Edge. It's an open issue on Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1281469

Wow. Firefox should really prioritize this if all major browsers are doing it already.

There is a theory which states that if ever anyone discovers exactly which decade old bug should be fixed in Firefox, it will instantly disappear and be replaced by some obscure web service by Mozilla Foundation. There is another theory which states that this has already happened.

(in memory of Douglas Adams)

Let's test that theory:

It's this one. https://bugzilla.mozilla.org/show_bug.cgi?id=505521

Introducing RunSet™ by Mozilla Foundation: an installation customizer for Mozilla suite of software. Just visit mozilla.org/runset, click on what pieces of software you want, and a custom installer is generated just for you. You can even embed your profile picture to the installer to share it with your friends and family. Fully customizable, fully free.

RunSet™: Install everything everywhere all at once.

[Donate]

But not Brave apparently

Looks like it's in the beta https://github.com/brave/brave-browser/issues/22482.