Guide to the Secure Configuration of Firefox

This guide presents a catalog of security-relevant configuration settings for Firefox. It is a rendering of content structured in the eXtensible Configuration Checklist Description Format (XCCDF) in order to support security automation. The SCAP content is is available in the scap-security-guide package which is developed at

Providing system administrators with such guidance informs them how to securely configure systems under their control in a variety of network roles. Policy makers and baseline creators can use this catalog of settings, with its associated references to higher-level security control catalogs, in order to assist them in security baseline creation. This guide is a catalog, not a checklist, and satisfaction of every item is not likely to be possible or sensible in many operational scenarios. However, the XCCDF format enables granular selection and adjustment of settings, and their association with OVAL and OCIL content provides an automated checking capability. Transformations of this document, and its associated automated checking content, are capable of providing baselines that meet a diverse set of policy objectives. Some example XCCDF Profiles, which are selections of items that form checklists and can be used as baselines, are available with this guide. They can be processed, in an automated fashion, with tools that support the Security Content Automation Protocol (SCAP). The DISA STIG for Firefox, which provides required settings for US Department of Defense systems, is one example of a baseline created from this guidance.
Do not attempt to implement any of the settings in this guide without first testing them in a non-operational environment. The creators of this guidance assume no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic.

Profile Information

Profile ID(default)

CPE Platforms

  • cpe:/a:mozilla:firefox

Revision History

Current version: 0.1.43

  • draft (as of 2019-02-21)

Table of Contents

  1. Remediation functions used by the SCAP Security Guide Project
  2. Firefox
    1. Clearing Cookies And Other Data
    2. Prevent Users from Changing Firefox Configuration Settings
    3. The DoD Root Certificate Is Required


Group   Guide to the Secure Configuration of Firefox
Group   Remediation functions used by the SCAP Security Guide Project

[ref]   XCCDF form of the various remediation functions as used by remediation scripts from the SCAP Security Guide Project.

Group   Firefox

[ref]   Firefox is an open-source web browser and developed by Mozilla. Web browsers such as Firefox are used for a number of reasons. This section provides settings for configuring Firefox policies to meet compliance settings for Firefox running on Red Hat Enterprise Linux systems.

Group   Clearing Cookies And Other Data

[ref]   Browser preferences should be set to perform a Clear Private Data operation when closing the browser in order to clear cookies and other data installed by websites visited during the session.

Group   Prevent Users from Changing Firefox Configuration Settings

[ref]   Firefox required security preferences cannot be changed by users.

Group   The DoD Root Certificate Is Required

[ref]   The Shared System Certificates store contains certificates that applications can access for a single certificate repository. If enabled, Firefox can access that single system certificate repository. If the DoD root certificate is also installed into the shared system certificate repository, Firefox will see and use the DoD root certificate as a valid certificate authority.

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