← Back to Mozilla Firefox Security Technical Implementation Guide

V-251549

CAT II (Medium)

Firefox must be configured to not automatically update installed add-ons and plugins.

Rule ID

SV-251549r960963_rule

STIG

Mozilla Firefox Security Technical Implementation Guide

Version

V6R7

CCIs

CCI-000381

Discussion

Set this to false to disable checking for updated versions of the Extensions/Themes. Automatic updates from untrusted sites puts the enclave at risk of attack and may override security settings.

Check Content

Type "about:policies" in the browser window.

If "ExtensionUpdate" is not displayed under Policy Name or the Policy Value is not "false", 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\Extensions
Policy Name: Extension Update
Policy State: Disabled

macOS "plist" file:
Add the following:
<key>ExtensionUpdate</key>
<false/>

Linux "policies.json" file:
Add the following in the policies section:
"ExtensionUpdate": false