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A much more honorable way to do this would have been to allow the search of a hash of your email rather than your actual email.

That's... exactly what they're doing?

Double-checking source code @ haveibeenpwned.com. I see no javascript that hashes your email address before submission.

Sure, but that's not what the linked article is discussing as the basis for integration with Firefox.

Well the email k-anonymity is new that he added for this integration and Troy addresses why he’s not yet using it on HIBP in the article.