Firefox Enhanced Tracking Protection must be enabled.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-251569	SRG-APP-000141	FFOX-00-000025	SV-251569r1067561_rule	2025-02-11	6

Description
Tracking generally refers to content, cookies, or scripts that can collect browsing data across multiple sites. It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Applications are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of nonessential capabilities include but are not limited to advertising software or browser plug-ins that are not related to requirements or provide a wide array of functionality not required for every mission but that cannot be disabled.

Description

Tracking generally refers to content, cookies, or scripts that can collect browsing data across multiple sites. It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Applications are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of nonessential capabilities include but are not limited to advertising software or browser plug-ins that are not related to requirements or provide a wide array of functionality not required for every mission but that cannot be disabled.

ℹ️ Check
Type "about:policies" in the browser address bar. If "Preferences" is not displayed under Policy Name or the Policy Value does not include "browser.contentblocking.category" with a value of "strict" and status of "locked", this is a finding.

✔️ Fix
Windows group policy: 1. Open the group policy editor tool with "gpedit.msc". 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\ Policy Name: Preferences Policy State: Enabled Policy Value: { "browser.contentblocking.category": { "Value": "strict", "Status": "locked" } } macOS "plist" file: Add the following: <key>Preferences</key> <dict> <key>browser.contentblocking.category</key> <dict> <key>Value</key> <string>strict</string> <key>Status</key> <string>locked</string> </dict> </dict> Linux "policies.json" file: Add the following in the policies section: "Preferences": { "browser.contentblocking.category": { "Value": "strict", "Status": "locked" } }

✔️ Fix

Windows group policy: 1. Open the group policy editor tool with "gpedit.msc". 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\ Policy Name: Preferences Policy State: Enabled Policy Value: { "browser.contentblocking.category": { "Value": "strict", "Status": "locked" } } macOS "plist" file: Add the following: <key>Preferences</key> <dict> <key>browser.contentblocking.category</key> <dict> <key>Value</key> <string>strict</string> <key>Status</key> <string>locked</string> </dict> </dict> Linux "policies.json" file: Add the following in the policies section: "Preferences": { "browser.contentblocking.category": { "Value": "strict", "Status": "locked" } }