Site Preferences

Supported on: Firefox 74 or later, Firefox 68.6 ESR or later

Registry

HKLM Software\Policies\Mozilla\Firefox\SanitizeOnShutdown

HKCU Software\Policies\Mozilla\Firefox\SanitizeOnShutdown

Value name: SiteSettings

Enabled: SiteSettings = 1

Disabled: SiteSettings = 0

Description

If the policy is enabled, site preferences are cleared when the browser is closed. If this policy is disabled or not configured, site preferences are not cleared when the browser is closed.