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 | 2026-05-08 | 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