Comment 24 for bug 1827727

(In reply to Alex from comment #20)

> Stable, Beta, Nightly and Dev got hit for me.
> I took off from work early today but someone from work texted me earlier and said about 200+ dev stations (major media conglomerate most people have heard of at one point in their life or another) got fuzzed hard thanks to this expired certificate.
> Really surprised Mozilla is this careless about renewals.

The only difference between release and the others is that non-release versions allow you to disable the check. It comes enabled by default for obvious reasons, like how malicious actors convinced people to download Chrome Canary to sidestep the safeguards on their release versions.