Mozilla Monitor

Mozilla Monitor is a free online service developed by Mozilla that helps individuals detect whether their personal information has been exposed in data breaches. The core functionality revolves around scanning known data breach databases using a user’s email address. When a user enters their email on the site, Mozilla Monitor checks it against a continuously updated repository of breach records—publicly disclosed incidents where companies or services have had their user data compromised. The scan reveals the number and types of exposures associated with that email, such as compromised passwords, credit card numbers, bank account details, phone numbers, and other personal identifiers. For example, a typical scan result might show that an email appears in multiple breaches, with counts for each category: four exposed passwords, three credit card numbers, two bank account numbers, and four email addresses. Beyond the initial check, Mozilla Monitor provides ongoing surveillance. Once a user signs in (using a Mozilla account), the service automatically monitors for new data breaches that might affect their email. If a new breach is discovered, the user receives an alert with details about which types of data were leaked and which service was involved. This continuous monitoring ensures that users stay informed even months or years after their first scan. In addition to detection, Mozilla Monitor offers actionable guidance. For each identified exposure, the site explains what the specific data type means for personal security. For instance, if a password is exposed, the service advises the user to change that password immediately and to use a unique, strong password for every account. If a credit card number is leaked, it suggests contacting the bank to issue a new card. The