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It looks like they're not doing this, but it is also possible to see if your exact password is in the breach using an algorithm called k-anonymity:

https://blog.cloudflare.com/validating-leaked-passwords-with...

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Mozilla are using k-anonymity in their FirefoxMonitor service[0]. This feature syncs from FirefoxMonitor to a local browser DB and checks against that DB. However, I'm not 100% sure what data it syncs from FirefoxMonitor (obviously a subset, but I don't know how that's chosen. I'm not sure if they're using k-anon for requests between the Firefox browser and their own service).

[0] https://github.com/mozilla/blurts-server/blob/master/hibp.js...

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