Mozilla Monitor is a free Mozilla breach service: a first scan on the site, then alerts if you keep a Mozilla account. EmailLeaked is a no-signup check with the result in this tab. Use both if you like. Neither replaces the gold-standard public index, and neither crawls the live dark web. Last updated: September 2026.
Mozilla Monitor and EmailLeaked are complementary tools, not rivals. Monitor is built for people who already live in the Mozilla world and want mail when a new named incident is collected. EmailLeaked is built for the minute you want an answer in this browser tab without creating an account. Both can be useful. Neither one is a live dark-web crawl.
This page is the honesty comparison. It does not restore the thin “vs Have I Been Pwned” posts that still redirect home. Have I Been Pwned remains the gold-standard public index for named incidents. Mozilla’s own help pages credit that index as Monitor’s breach source. EmailLeaked checks industry-standard breach data sources and does not claim a bigger archive. The wider free-tool map is in free data breach checkers compared.
What is the difference between Mozilla Monitor and EmailLeaked?
They answer the same first question — “does this email appear in known leak records?” — then they spend the rest of the product on different habits.
| If you want… | Start here |
|---|---|
| An answer in this tab, no account | EmailLeaked email checker |
| Free alerts when a new named incident is collected | Mozilla Monitor (Mozilla account) |
| The widest public incident index most people will ever see | Have I Been Pwned |
| A password lookup that never sends the full secret | EmailLeaked password checker |
Mozilla Monitor is the free Mozilla / Firefox-family breach service. The homepage lets you type an address and start a scan. Continuous monitoring, extra addresses, and the fuller “resolve this breach” dashboard are built around a Mozilla account. Mozilla’s how-it-works page, as of 2026, says subscribers can monitor five email addresses for free. Paid Monitor Plus is a separate broker-removal product. It is not required for a first look.
EmailLeaked sits next to that, not above it. You paste an address, see the incidents we can search, and get a short plan in ordinary language. We do not keep the address you type. We do not ask you to register. We do not sell a watch-list dashboard.
The Verizon 2024 Data Breach Investigations Report again found stolen or guessed logins in a large share of web-application breaches. After either tool, the work that matters is still unique passwords and a second factor.
Does Mozilla Monitor require an account?
Not for a first public scan. Mozilla’s help pages say you may search publicly available breaches without signing up.
An account becomes the product when you want ongoing alerts. Someone has to store the address they are watching. Mozilla also hides some “sensitive” incidents from a public search until you verify the inbox. That is a privacy choice, not a trick. It means a no-account scan can miss a row that appears after you sign in.
As of 2026:
- No account — a public scan of named, non-sensitive incidents
- Mozilla account — alerts, extra addresses (Mozilla currently says five), and the dashboard that walks you through marking items resolved
- Monitor Plus — paid broker-removal help, a different job
EmailLeaked’s email check and password check do not require an account at all. That is the whole difference we actually ship. It is not a claim that we outrank Mozilla, and it is not a claim that alerts are a bad idea.
How do signup and privacy tradeoffs compare?
A one-off lookup and a watch list have different privacy costs. Pretending they are the same is how people either over-share or refuse a useful alert.
EmailLeaked, first look. The service has to receive the address to compare it. We do not keep that address, write it to a results database, or add it to a mailing list. Ordinary website hosting logs still exist. A privacy-oriented analytics beacon can still record that the page was visited. That is enough privacy for a lookup. It is not invisibility. Read the wording on the privacy policy and the method notes on editorial standards.
Mozilla Monitor, alerts. You create a Mozilla account and confirm the inboxes you want watched. Mozilla then has those addresses on file so it can mail you later. That is the fair trade for a watch list. If you already have a Firefox / Mozilla login, the extra account cost is small. If you do not want another login, do the no-signup check first and decide later.
Neither model is “more private” in every sentence. A stored watch list is more data at rest. A no-account page still has hosting logs. Absolute no-logs wording and “nobody can tie this visit to you” are overclaims. We will not write those, and you should not believe them on any checker.
Be wary of “free” tools that hide every useful line behind a credit card, ask for a password in plain text, or demand a government ID for a preview. A first check only needs an email address.
Want the no-signup check first? See if your email appears in known breaches → — we do not keep the address you type. Add Mozilla Monitor later if you want alerts.
Does Mozilla Monitor use Have I Been Pwned?
Where Mozilla’s own help pages say so, yes: Monitor gets its breach information from Have I Been Pwned. That is the gold-standard public index for named incidents. Researchers and other consumer tools treat that catalog as the reference. Crediting it is accurate. Trash-talking it is not.
EmailLeaked does not claim a bigger database, exclusive dumps, or a live underground crawl. We check industry-standard breach data sources, show the incidents we can search, and turn a match into a short plan. If you only bookmark one raw catalog, bookmark Have I Been Pwned. If you want a second opinion in this tab, use us. If you want mail later, use Monitor.
Catalogs refresh on different schedules. Some hide sensitive incidents until you verify the inbox. A miss on one site is not a lifetime all-clear. If either tool finds you, change reused passwords and turn on two-factor authentication.
As of 2026, public catalogs still describe on the order of a thousand named incidents and more than 12 billion compromised records. That is a lot of history. It is still not a live map of every underground sale. How email breach checkers work explains the library-versus-camera limit.
When should you use EmailLeaked instead of Mozilla Monitor?
Use EmailLeaked when the job is now, in this tab.
That is the right first stop when:
- You do not want to create an account to see a public result
- You want the next-step list in ordinary language on the same page
- You also want a password leak check that never sends the full password
- You arrived from a vague “dark web” warning and need a snapshot, not a dashboard
Use Mozilla Monitor when the job is watch this inbox for me. That is the right stop when you already have a Mozilla account, you want mail from breach-alerts@mozilla.com, or you want several addresses on one dashboard.
Use both when the first result is empty and you still have a reason to worry — a company notice, a password-reset you did not start, or a compiled list with a vague name. Do not use twelve. After two honest lookups and a password check, spend the time on unique passwords and two-factor authentication.
If you arrived because Google retired Dark Web Report, the replacement is this same known-breach lookup — not a new crawl. The walkthrough is in Google Dark Web Report: what to use instead.
Can you use Mozilla Monitor and EmailLeaked together?
Yes. That is the intended reading of this page.
A sensible pairing:
- Run the EmailLeaked checker for a no-signup snapshot.
- If a password may have leaked, run the password leak checker.
- Follow what to do after a data breach.
- If you want alerts later, add the same addresses to Mozilla Monitor and verify them.
If the two tools disagree, believe the match. A hidden sensitive incident, a refresh lag, or a compiled list under a different name can split the results. Treat either match as a to-do list.
They are not a ranked trophy list. Mozilla does not pay us to say this, and we do not pay Mozilla. If Monitor’s free tier or address limit changes, this page will need a date stamp — it already has one: September 2026.
What should you do after either tool finds a match?
The tool is the first minute. The account work is the rest.
- Match, password involved. Change that password on the named service and everywhere you reused it. Then run the password leak checker. A password manager after a breach keeps the replacements unique; how to secure your email account covers the inbox first.
- Match, email only. Expect more phishing that uses a real old service name. Still use a unique email password and two-factor authentication.
- No match. Recheck after a company you use announces a leak. A clean page is a snapshot, not permission to reuse one password everywhere.
- Confused by the incident name. Open the breach catalog or the matching explainer. Collection #1 is the usual example of a huge compiled set rather than one company failing last Tuesday.
A match is not proof someone is inside the inbox tonight. That split is in data breach vs email hacked. Anyone selling “dark web removal” after either scan is describing a job that cannot finish. The scan-versus-database split is in dark web scan vs public breach database.
- Mozilla Monitor is a fair free alert service if you keep a Mozilla account.
- EmailLeaked is a no-signup second opinion with next steps, not a claim we replaced Monitor or the gold-standard index.
- Mozilla’s help pages credit Have I Been Pwned as Monitor’s breach source. That credit is accurate.
- Signup is the price of a watch list. It is not required for a first look.
- Use both if you like a second opinion. Then do the password work.
Check your email if you want the EmailLeaked pass now. Use Mozilla Monitor if you want alerts. Compare other free options on the free checkers hub.