Firefox must be configured to not delete data upon shutdown.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-252881 | FFOX-00-000017 | SV-252881r960963_rule | CCI-000381 | medium |
| Description | ||||
| For diagnostic purposes, data must remain behind when the browser is closed. This is required to meet non-repudiation controls. | ||||
| STIG | Date | |||
| Mozilla Firefox Security Technical Implementation Guide | 2025-02-11 | |||
Details
Check Text (C-252881r960963_chk)
Type "about:policies" in the browser address bar.
If "SanitizeOnShutdown" is not displayed under Policy Name or the Policy Value does not have {"Cache":false,"Cookies":false,"Downloads":false,"FormData":false,"Sessions":false,"History":false,"OfflineApps":false,"SiteSettings":false,"Locked":true}, this is a finding.
Fix Text (F-56287r820756_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\Clear data when browser is closed
Policy Name: Cache, Cookies, Download History, Form & Search History, Browsing History, Active Logins, Site Preferences, Offline Website Data
Policy State: Disabled
Policy Name: Locked
Policy State: Enabled
macOS "plist" file:
Add the following:
<key>SanitizeOnShutdown</key>
<dict>
<key>Cache</key>
<false/>
<key>Cookies</key>
<false/>
<key>Downloads</key>
<false/>
<key>FormData</key>
<false/>
<key>History</key>
<false/>
<key>Sessions</key>
<false/>
<key>SiteSettings</key>
<false/>
<key>OfflineApps</key>
<false/>
<key>Locked</key>
<true/>
</dict>
Linux "policies.json" file:
Add the following in the policies section:
"SanitizeOnShutdown": {
"Cache": false,
"Cookies": false,
"Downloads": false,
"FormData": false,
"History": false,
"Sessions": false,
"SiteSettings": false,
"OfflineApps": false,
"Locked": true
}