Firefox autoplay must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-251565 | FFOX-00-000021 | SV-251565r960963_rule | CCI-000381 | low |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Mozilla Firefox Security Technical Implementation Guide | 2025-02-11 | |||
Details
Check Text (C-251565r960963_chk)
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.
Fix Text (F-54954r807166_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\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"
}
}