STIGQter: STIG Summary: Mozilla Firefox Security Technical Implementation Guide Version: 6 Release: 8 Benchmark Date: 01 Jul 2026:

Firefox must be configured to prevent JavaScript from moving or resizing windows.

DISA Rule

SV-251554r1067554_rule

Vulnerability Number

V-251554

Group Title

SRG-APP-000141

Rule Version

FFOX-00-000010

Severity

CAT II

CCI(s)

• CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.

Weight

10

Fix Recommendation

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_move_resize": {
"Value": true,
"Status": "locked"
}
}

macOS "plist" file:
Add the following:
<key>Preferences</key>
<dict>
<key>dom.disable_window_move_resize</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_move_resize": {
"Value": true,
"Status": "locked"
}
}

Check Contents

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

If "Preferences" is not displayed under Policy Name or the Policy Value does not include "dom.disable_window_move_resize" with a value of "true" and status of "locked", this is a finding.

Vulnerability Number

V-251554

Documentable

False

Rule Version

FFOX-00-000010

Severity Override Guidance

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

If "Preferences" is not displayed under Policy Name or the Policy Value does not include "dom.disable_window_move_resize" with a value of "true" and status of "locked", this is a finding.

Check Content Reference

M

Target Key

5446