Firefox must be configured to not automatically check for updated versions of installed search plugins.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-251548	FFOX-00-000004	SV-251548r807116_rule		Medium

Description
Updates must be controlled and installed from authorized and trusted servers. This setting overrides a number of other settings that may direct the application to access external URLs.

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

Details

Check Text ( C-54983r807114_chk )
Type "about:policies" in the browser address bar. If "browser.search.update" is not displayed with a value of "false", this is a finding.

Fix Text (F-54937r807115_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.search.update": { "Value": false, "Status": "locked" } } macOS "plist" file: Add the following: Preferences browser.search.update Value Status locked Linux "policies.json" file: Add the following in the policies section: "Preferences": { "browser.search.update": { "Value": false, "Status": "locked" } }

Fix Text (F-54937r807115_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.search.update": {
"Value": false,
"Status": "locked"
}
}

macOS "plist" file:
Add the following:
Preferences

browser.search.update

Value

Status
locked

Linux "policies.json" file:
Add the following in the policies section:
"Preferences": {
"browser.search.update": {
"Value": false,
"Status": "locked"
}
}