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

• rhencke 8y ago
  Sure, but that's not what the linked article is discussing as the basis for integration with Firefox.
• snowwolf 8y ago
  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.