STIGQter: STIG Summary: Mozilla Firefox Security Technical Implementation Guide Version: 6 Release: 8 Benchmark Date: 01 Jul 2026:

Firefox must be configured to not delete data upon shutdown.

DISA Rule

SV-252881r960963_rule

Vulnerability Number

V-252881

Group Title

SRG-APP-000141

Rule Version

FFOX-00-000017

Severity

CAT II

CCI(s)

CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.

Weight

Fix Recommendation

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
}

Check Contents

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.

Vulnerability Number

V-252881

Documentable

False

Rule Version

FFOX-00-000017

Severity Override Guidance

Check Content Reference

Target Key

5446