What's New with Firefox 142

I have found the majority of these relay services utterly useless. A large number of sites are using some kind of email verification service/API that detect all these relay/trash domains (mailinator etc.) and you can never sign up unless you have a legit domain. I'd be astonished if mozmail.com wasn't already on this list.

I'm not saying I don't value the idea behind this, but at least with Apple they are using their primary domain as a relay meaning it's too risky to block all the legitimate addresses.

Have been using FireFox Relay for a couple of years now and can coun't the amount of sites which have denied my signup on a single hand.

I'd say that's lucky. I'm using "Masked Email" on Fastmail with a personal domain and I still find that I get blocked from signups from time to time. I assume they're looking for some sort of pattern?