The Firefox New Tab page must not show highlights.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-251575	FFOX-00-000031	SV-251575r807197_rule		Medium

Description
The New Tab page by default shows the sites the user visits the most. The new tab page must not actively show user activity. 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 non-essential 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

The New Tab page by default shows the sites the user visits the most. The new tab page must not actively show user activity. 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 non-essential 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.

STIG	Date
Mozilla Firefox Security Technical Implementation Guide	2021-12-01

Details

Check Text ( C-55010r807195_chk )
Type "about:policies" in the browser address bar. If "FirefoxHome" is not displayed under Policy Name or the Policy Value does not have "Highlights" with a value of "false", this is a finding.

Fix Text (F-54964r807196_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: Customize Firefox Home Policy State: Enabled Policy Value: Uncheck Download History macOS "plist" file: Add the following: FirefoxHome Highlights Linux "policies.json" file: Add the following in the policies section: "FirefoxHome": { "Highlights": false }

Fix Text (F-54964r807196_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: Customize Firefox Home
Policy State: Enabled
Policy Value: Uncheck Download History

macOS "plist" file:
Add the following:
FirefoxHome

Highlights

Linux "policies.json" file:
Add the following in the policies section:
"FirefoxHome": {
"Highlights": false
}