Firefox Studies must be disabled.

Severity
Group ID
Group Title
Version
Rule ID
Date
STIG Version
mediumV-252909SRG-APP-000141FFOX-00-000039SV-252909r960963_rule2025-02-116
Description
Studies try out different features and ideas before they are released to all Firefox users. Testing beta software is not in the DoD user's mission.
ℹ️ Check
Type "about:policies" in the browser address bar. If "DisableFirefoxStudies" is not displayed under Policy Name or the Policy Value does not have a value of "true", this is a finding.
✔️ 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 Policy Name: Disable Firefox Studies Policy State: Enabled macOS "plist" file: <key>DisableFirefoxStudies</key> <true/> Linux "policies.json" file: Add the following in the policies section: "DisableFirefoxStudies": true