Check if an email is registered on Mozilla

What we check on Mozilla

Instant tier for email address lookups - answered in well under a second

Mozilla is checked from an email address. The response says whether that address has a Mozilla account - registered: true or registered: false - with the moment that was established in checkedAt. A username on its own cannot reach Mozilla, so username lookups do not include it.

Mozilla is in the instant tier: with ?instant=true it is among the first platforms answered, in well under a second. On a full lookup it is checked alongside every other platform and streamed as it lands.

If Mozilla blocks the check, times out, or answers ambiguously, it is omitted from results[] entirely rather than returned as registered: false. Absence from the response means "unconfirmed", never "no account".

Who checks Mozilla accounts

Identity providers, link-in-bio pages and everyday utilities are checked because almost everyone has an account on at least one of them. An email with no presence even here is unusual, which makes these platforms a useful baseline in any footprint.

More on this: Email fraud detection.

Inputs Mozilla accepts

• Email address: send it as email. Mozilla is checked from the address itself, the most common way teams look up an account at signup.

One request

curl -X POST "https://api.digifootprint.dev/v2/lookup?wait=true" \
  -H "Authorization: Bearer dfp_your_key" \
  -H "Content-Type: application/json" \
  -d '{"email": "someone@example.com"}'

What a Mozilla result looks like

{
  "platform": "mozilla",
  "registered": true,
  "checkedAt": "2026-10-15T09:53:17.743Z",
  "identity": "email"
}

The full response shape - breaches, web mentions, matches versus socialMatches, and what method means - is in running a lookup.

Related platforms

Every one of these is checked in the same request as Mozilla.

More accounts & identity platforms: About.me, Instructables, Ameblo, Huggingface, Pypi, Douban · all accounts & identity

Mozilla lookup FAQ

Can I check a phone number on Mozilla?

Not directly. Mozilla can be reached from email address only. Phone numbers are checked on the messaging and social apps that sign people up by phone.

How fast is a Mozilla check?

Fast: Mozilla is in the instant tier, so with ?instant=true it is answered in well under a second. A full lookup streams it as soon as it lands.

Is this a Mozilla email checker?

It checks whether an email address is registered on Mozilla, which is the question most people mean by an email checker. It is not a password or credential checker, and not a deliverability test - it never signs in, never sends mail, and returns only whether a Mozilla account exists for the address, with the time that was established.

What happens if Mozilla blocks the check?

Mozilla is left out of the response. We never report a platform we could not confirm as "not registered" - a missing platform means unconfirmed, not absent.

Does the API return the Mozilla account details?

No. You get whether an account exists for the input you sent, and when that was established. No profile contents, photos, followers or private data are collected or returned.