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

Firefox autoplay must be disabled.

DISA Rule

SV-251565r960963_rule

Vulnerability Number

V-251565

Group Title

SRG-APP-000141

Rule Version

FFOX-00-000021

Severity

CAT III

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\Permissions\Autoplay
Policy Name: Default autoplay level
Policy State: Enabled
Policy Value: Block Audio and Video

macOS "plist" file:
Add the following:
<key>Permissions</key>
<dict>
<key>Autoplay</key>
<dict>
<string>block-audio-video</string>
</dict>
</dict>

Linux "policies.json" file:
Add the following in the policies section:
"Permissions": {
"Autoplay": {
"Default": "block-audio-video"
}
}

Check Contents

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

If "Permissions" is not displayed under Policy Name or the Policy Value is not "Autoplay" with a value of "Default" and "Block-audio-video", this is a finding.

Vulnerability Number

V-251565

Documentable

False

Rule Version

FFOX-00-000021

Severity Override Guidance

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

If "Permissions" is not displayed under Policy Name or the Policy Value is not "Autoplay" with a value of "Default" and "Block-audio-video", this is a finding.

Check Content Reference

M

Target Key

5446