Mozilla Security Blog

Measuring Middlebox Interference with DNS Records

Overview The Domain Name System (DNS) is often referred to as the “phonebook of the Internet.” It is responsible for translating human readable domain names–such as mozilla.org–into IP addresses, which … Read more

Firefox 83 introduces HTTPS-Only Mode

  Security on the web matters. Whenever you connect to a web page and enter a password, a credit card number, or other sensitive information, you want to be sure … Read more

May 2020 CA Communication

Mozilla has sent a CA Communication and Survey to inform Certification Authorities (CAs) who have root certificates included in Mozilla’s program about current expectations. Additionally this survey will collect input … Read more

Expanding Client Certificates in Firefox 75

Starting in version 75, Firefox can be configured to use client certificates provided by the operating system on Windows and macOS. Background When Firefox negotiates a secure connection with a … Read more

Multi-Account Containers Add-on Sync Feature

The Multi-Account Containers Add-on will now sync your container configuration and site assignments. Firefox Multi-Account Containers allows users to separate their online identities into different tab types called Containers. Each … Read more

CRLite: Speeding Up Secure Browsing

CRLite pushes bulk certificate revocation information to Firefox users, reducing the need to actively query such information one by one. Additionally this new technology eliminates the privacy leak that individual … Read more