"The encrypted email provider announced Thursday it will allow its users to access the site through the Tor anonymity service.
The aim is to allow its more than 2 million users access the provider by taking "active measures to defend against state-sponsored censorship," such as government-mandated blocks at the internet provider level.
Users of the Tor Browser can now access the site at https://protonirockerxow.onion. "
This makes them the 3rd site which has valid cert from digicert. Right? Or are there others that I've missed?
PS: Unfortunately, it seems that it only works on their login page and they've hardcoded clearnet URLs elsewhere. They also seem to have some redirection issues.