Firefox autoplay must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-251565	FFOX-00-000021	SV-251565r807167_rule		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	2021-12-01

Details

Check Text ( C-55000r807165_chk )
Type "about:policies" in the browser address bar. If "Permissions->Autoplay" is not displayed under Policy Name or the Policy Value is not "block-audio-video" with a value of "true", 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: Permissions Autoplay block-audio-video Linux "policies.json" file: Add the following in the policies section: "Permissions": { "Autoplay": { "Default": "block-audio-video" } }

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:
Permissions

Autoplay

block-audio-video

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