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Mozilla Security Blog

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Latest posts

Last updated 12 days ago

Measuring Middlebox Interference with DNS Records

12 days ago

Overview The Domain Name System (DNS) is often referred to as the...

Firefox 83 introduces HTTPS-Only Mode

13 days ago

  Security on the web matters. Whenever you connect to a web page...

Preloading Intermediate CA Certificates into Firefox

16 days ago

Throughout 2020, Firefox users have been seeing fewer secure connection errors while...

Firefox 79 includes protections against redirect tracking

4 months ago

A little over a year ago we enabled Enhanced Tracking Protection (ETP)...

Reducing TLS Certificate Lifespans to 398 Days

5 months ago

We intend to update Mozilla’s Root Store Policy to reduce the maximum...

Performance Improvements via Formally-Verified Cryptography in Firefox

5 months ago

Cryptographic primitives, while extremely complex and difficult to implement, audit, and validate...

May 2020 CA Communication

7 months ago

Mozilla has sent a CA Communication and Survey to inform Certification Authorities...

Firefox’s Bug Bounty in 2019 and into the Future

7 months ago

Firefox has one of the oldest security bug bounties on the internet...

Expanding Client Certificates in Firefox 75

8 months ago

Starting in version 75, Firefox can be configured to use client certificates...

Firefox 75 will respect ‘nosniff’ for Page Loads

8 months ago

Prior to being able to display a web page within a browser...

Multi-Account Containers Add-on Sync Feature

10 months ago

The Multi-Account Containers Add-on will now sync your container configuration and site...

CRLite: Speeding Up Secure Browsing

10 months ago

CRLite pushes bulk certificate revocation information to Firefox users, reducing the need...