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V-251570

CAT II (Medium)

Firefox extension recommendations must be disabled.

Rule ID

SV-251570r1067563_rule

STIG

Mozilla Firefox Security Technical Implementation Guide

Version

V6R7

CCIs

CCI-000381

Discussion

The Recommended Extensions program makes it easier for users to discover extensions that have been reviewed for security, functionality, and user experience. Allowed extensions are to be centrally managed.

Check Content

Type "about:policies" in the browser address bar. 

If "Preferences" is not displayed under Policy Name and the Policy Value does not include "extensions.htmlaboutaddons.recommendations.enabled" with a value of  "false" and status of "locked", this is a finding.

Fix Text

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:
{
  "extensions.htmlaboutaddons.recommendations.enabled": {
    "Value": false,
    "Status": "locked"
  }
}

macOS "plist" file:
Add the following:
<key>Preferences</key>
<dict>
  <key>extensions.htmlaboutaddons.recommendations.enabled</key>
  <dict>
    <key>Value</key>
    <false/>
    <key>Status</key>
    <string>locked</string>
  </dict>
</dict>

Linux "policies.json" file:
Add the following in the policies section:
"Preferences": {
"extensions.htmlaboutaddons.recommendations.enabled": {
"Value": false,
"Status": "locked"
},