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V-251565

CAT III (Low)

Firefox autoplay must be disabled.

Rule ID

SV-251565r960963_rule

STIG

Mozilla Firefox Security Technical Implementation Guide

Version

V6R7

CCIs

CCI-000381

Discussion

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.

Check Content

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

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"
  }
}