Firefox must be configured to prevent JavaScript from raising or lowering windows.

An XCCDF Rule

Description

JavaScript can raise and lower browser windows to cause improper input. Configure the browser setting to prevent scripts on visited websites from raising and lowering browser windows.

ID: SV-251555r879587_rule
Version: FFOX-00-000011
Severity: Medium
References: CCI-000381
Updated: 5 days ago

Remediation Templates

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.disable_window_flip": {
    "Value": true,
    "Status": "locked"
  }
}

macOS "plist" file:
Add the following:
<key>Preferences</key>
<dict>
  <key>dom.disable_window_flip</key>
  <dict>
    <key>Value</key>
    <true/>
    <key>Status</key>
    <string>locked</string>
  </dict>
</dict>

Linux "policies.json" file:
Add the following in the policies section:
"Preferences": {
  "dom.disable_window_flip": {
    "Value": true,
    "Status": "locked"
  }
}

Firefox must be configured to prevent JavaScript from raising or lowering windows.

Description

Remediation Templates

A Manual Procedure