Firefox must be configured to not delete data upon shutdown.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-251561	FFOX-00-000017	SV-251561r807155_rule		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	2021-12-01

Details

Check Text ( C-54996r807153_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-54950r807154_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: SanitizeOnShutdown Cache Cookies Downloads FormData History Sessions SiteSettings OfflineApps Locked 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 }

Fix Text (F-54950r807154_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:
SanitizeOnShutdown

Cache

Cookies

Downloads

FormData

History

Sessions

SiteSettings

OfflineApps

Locked

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
}