Firefox must be configured to disable form fill assistance.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-251551	SRG-APP-000141	FFOX-00-000007	SV-251551r960963_rule	2025-02-11	6

Description
To protect privacy and sensitive data, Firefox provides the ability to configure the program so that data entered into forms is not saved. This mitigates the risk of a website gleaning private information from prefilled information.

ℹ️ Check
Type "about:policies" in the browser window. If "DisableFormHistory" is not displayed under Policy Name or the Policy Value is not "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 Form History Policy State: Enabled macOS "plist" file: Add the following: <key>DisableFormHistory</key> <true/> Linux "policies.json" file: Add the following in the policies section: "DisableFormHistory": true

✔️ 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 Form History Policy State: Enabled macOS "plist" file: Add the following: <key>DisableFormHistory</key> <true/> Linux "policies.json" file: Add the following in the policies section: "DisableFormHistory": true