SV-251565r960963: Firefox autoplay must be disabled. | Mozilla Firefox for Linux STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

Firefox autoplay must be disabled.

Description

Discussion Text

Autoplay allows the user to control whether videos can play automatically (without user consent) with audio content. The user must be able to select content that is run within the browser window.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000381

References

DPMS Target Mozilla Firefox 2021 VERSION DISA DPMS Target Mozilla Firefox 2021 VERSION 5446

Checks

DISA STIG (Manual Reference)

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.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# DISA STIG / SCAP compliance check: oval:mil.disa.stig.firefox.linux:def:120

FILE="/etc/mozilla/policies.json"

if [ ! -f "$FILE" ]; then
  echo "PASS"
  exit 0
fi

grep -q '"Autoplay":{"Default":"block-audio-video"}' "$FILE" && echo "PASS" || echo "FAIL"
exit 0

Remediation

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"
  }
}