Mozilla Security Blog

Updating GPG key for signing Firefox Releases

Mozilla offers GPG signing to let you verify the integrity of our Firefox builds. GPG signatures for Linux based builds are particularly important, because it allows Linux distributions and other … Read more

Updates to Firefox’s Breach Alert Policy

Your personal data is yours – and it should remain yours! Unfortunately data breaches that reveal your personal information on the internet are omnipresent these days. In fact, fraudulent use … Read more

Introducing Site Isolation in Firefox

When two major vulnerabilities known as Meltdown and Spectre were disclosed by security researchers in early 2018, Firefox promptly added security mitigations to keep you safe. Going forward, however, it … Read more

Firefox 86 Introduces Total Cookie Protection

Today we are pleased to announce Total Cookie Protection, a major privacy advance in Firefox built into ETP Strict Mode. Total Cookie Protection confines cookies to the site where they … Read more

Firefox 85 Cracks Down on Supercookies

Trackers and adtech companies have long abused browser features to follow people around the web. Since 2018, we have been dedicated to reducing the number of ways our users can … Read more

Encrypted Client Hello: the future of ESNI in Firefox

Background Two years ago, we announced experimental support for the privacy-protecting Encrypted Server Name Indication (ESNI) extension in Firefox Nightly. The Server Name Indication (SNI) TLS extension enables server and … Read more