Firefox is the only browser that received top marks in a recent audit carried out by Germany’s cyber-security agency — the German Federal Office for Information Security (or the Bundesamt für Sicherheit in der Informationstechnik — BSI).
The BSI tested Mozilla Firefox 68 (ESR), Google Chrome 76, Microsoft Internet Explorer 11, and Microsoft Edge 44. The tests did not include other browsers like Safari, Brave, Opera, or Vivaldi.
The BSI normally uses this guide to advise government agencies and companies from the private sector on what browsers are safe to use.
The German cyber-security agency published a first secure browser guideline in 2017, but reviewed and updated the specification over the summer.
The BSI updated its guide to account for improved security measures added to modern browsers, such as HSTS, SRI, CSP 2.0, telemetry handling, and improved certificate handling mechanisms.