Firefox must be configured to prevent JavaScript from disabling or replacing context menus.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-251556 | FFOX-00-000012 | SV-251556r807140_rule | Medium |
| Description |
|---|
| A website may execute JavaScript that can remove or replace context menus/pop-up menus. This can help disguise an attack. Set this preference to "false" so that web pages will not be able to affect the context menu event. |
| STIG | Date |
|---|---|
| Mozilla Firefox Security Technical Implementation Guide | 2021-12-01 |
Details
| Check Text ( C-54991r807138_chk ) |
|---|
| Type "about:policies" in the browser address bar. If "dom.event.contextmenu.enabled" is not displayed with a value of "false", this is a finding. |
| Fix Text (F-54945r807139_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: { "dom.event.contextmenu.enabled": { "Value": false, "Status": "locked" } } macOS "plist" file: Add the following: Linux "policies.json" file: Add the following in the policies section: "Preferences": { "dom.event.contextmenu.enabled": { "Value": false, "Status": "locked" } } |