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Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Known Vulnerabilities in Mozilla Products

The links below list security vulnerabilities known to affect particular versions of Mozilla products and instructions on what users can do to protect themselves. The lists will be added to when new security problems are found. For a complete list not sorted by product or version please see the Mozilla Foundation Security Advisories.

Please read Mozilla.org's security bug policy for information on how we handle security bugs. If you have found a security problem which is not on this list and has not already been filed as a bug in Bugzilla, or if you find errors or inconsistencies in this list, please mail us. If needed our PGP key can be found on the main security page.

Product Advisories

Advisories for older products

Firefox

Thunderbird

SeaMonkey

Older