| If true, bookmarks are restored to their defaults.
| browser.cache.disk.enable | boolean | Firefox 68, Firefox ESR 68 | true
| If false, don't store cache on the hard drive.
-| browser.cache.disk.parent_directory | string | Firefox 68, Firefox ESR 68 | Profile temporary directory
-| If set, changes the location of the disk cache.
+| ~browser.cache.disk.parent_directory~ | string | Firefox 68, Firefox ESR 68 | Profile temporary directory
+| ~If set, changes the location of the disk cache.~ This policy doesn't work. It's being worked on.
| browser.fixup.dns_first_for_single_words | boolean | Firefox 68, Firefox ESR 68 | false
| If true, single words are sent to DNS, not directly to search.
+| browser.newtabpage.activity-stream.default.sites | string | Firefox 72, ESR 68.4 | Locale dependent
+| If set, a list of URLs to use as the default top sites on the new tab page.
| browser.places.importBookmarksHTML | string | Firefox 70, Firefox ESR 68.2
| If true, bookmarks are always imported on startup.
| browser.safebrowsing.phishing.enabled | string | Firefox 70, Firefox ESR 68.2 | true
| If false, the extensions blocklist is not used (Not recommended)
| extensions.getAddons.showPane | boolean | Firefox 68, Firefox ESR 68 | N/A
| If false, the Recommendations tab is not displayed in the Add-ons Manager.
+| extensions.htmlaboutaddons.recommendations.enabled | boolean | Firefox 72, Firefox ESR 68.4 | true
+| If false, recommendations are not shown on the Extensions tab in the Add-ons Manager.
| geo.enabled | string | Firefox 70, Firefox ESR 68.2 | true
| If false, the geolocation API is disabled. | Language dependent
| intl.accept_languages | string | Firefox 70, Firefox ESR 68.2
| If false, the OpenH264 plugin is not downloaded.
| media.gmp-widevinecdm.enabled | boolean | Firefox 68, Firefox ESR 68 | true
| If false, the Widevine plugin is not downloaded.
+| media.peerconnection.enabled | boolean | Firefox 72, Firefox ESR 68.4 | true
+| If false, WebRTC is disabled
+| media.peerconnection.ice.obfuscate_host_addresses.whitelist | string | Firefox 72, Firefox ESR 68.4 | N/A
+| If set, a list of domains for which mDNS hostname obfuscation is
+disabled
| network.dns.disableIPv6 | boolean | Firefox 68, Firefox ESR 68 | false
| If true, IPv6 DNS lokoups are disabled.
| network.IDN_show_punycode | boolean | Firefox 68, Firefox ESR 68 | false
| If set to Select Automatically, Firefox automatically chooses the default personal certificate.
| security.mixed_content.block_active_content | string | Firefox 70, Firefox ESR 68.2 | true
| If false, mixed active content (HTTP and HTTPS) is not blocked.
+| security.osclientcerts.autoload | boolean | Firefox 72, Firefox ESR 68.4 (Windows only) | false
+| If true, client certificates are loaded from the operating system certificate store.
| security.ssl.errorReporting.enabled | boolean | Firefox 68, Firefox ESR 68 | true
| If false, SSL errors cannot be sent to Mozilla.
+| security.tls.hello_downgrade_check | boolean | Firefox 72, Firefox ESR 68.4 | true
+| If false, the TLS 1.3 downgrade check is disabled.
| ui.key.menuAccessKeyFocuses | boolean | Firefox 68, Firefox ESR 68 | true
| If false, the Alt key doesn't show the menubar on Windows.
+| widget.content.gtk-theme-override | string | Firefox 72, Firefox ESR 68.4 (Linux only) | N/A
+| If set, overrides the GTK theme for widgets.
#### Windows (GPO)
```
Software\Policies\Mozilla\Firefox\Preferences\boolean_preference_name = 0x1 | 0x0