Firefox private browsing must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-251563 | FFOX-00-000019 | SV-251563r960963_rule | CCI-000381 | medium |
| Description | ||||
| Private browsing allows the user to browse the internet without recording their browsing history/activity. From a forensics perspective, this is unacceptable. Best practice requires that browser history is retained. | ||||
| STIG | Date | |||
| Mozilla Firefox Security Technical Implementation Guide | 2025-02-11 | |||
Details
Check Text (C-251563r960963_chk)
Type "about:policies" in the browser window.
If "DisablePrivateBrowsing" is not displayed under Policy Name or the Policy Value is not "true", this is a finding.
Fix Text (F-54952r807160_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 Private Browsing
Policy State: Enabled
macOS "plist" file:
Add the following:
<key>DisablePrivateBrowsing</key>
<true/>
Linux "policies.json" file:
Add the following in the policies section:
"DisablePrivateBrowsing": true