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Re:Firefox 69.0 Released by shakna on Tuesday September 03, 2019 @10:45AM (#20866968)
It utilises K-anonymity, making it difficult if not impossible for this to become a massive data leak.

The email gets hashed on your device, and the start of that hash is sent off to the server. The server returns a list of all the hashes that might match. The client then checks that list for complete matches.

Re:Firefox 69.0 Released by megous on Tuesday September 03, 2019 @11:05AM (#20867182)
Sounds fairly reasonable. I was already getting afraid of my private email addresses being leaked via this check.