| **[`HardwareAcceleration`](#hardwareacceleration)** | Control hardware acceleration.
| **[`Homepage`](#homepage)** | Configure the default homepage and how Firefox starts.
| **[`InstallAddonsPermission`](#installaddonspermission)** | Configure the default extension install policy as well as origins for extension installs are allowed.
+| **[`LegacyProfiles`](#legacyprofiles)** | Disable the feature enforcing a separate profile for each installation.
| **[`LocalFileLinks`](#localfilelinks)** | Enable linking to local files by origin.
| **[`NetworkPrediction`](#networkprediction)** | Enable or disable network prediction (DNS prefetching).
| **[`NewTabPage`](#newtabpage)** | Enable or disable the New Tab page.
<string>https://yoursite.com</string>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
</array>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
#### Windows
```
-Software\Policies\Mozilla\Firefox\ExtensionSettings = '{"*": {"installation_mode": "blocked"}}'
+Software\Policies\Mozilla\Firefox\ExtensionSettings (REG_MULTI_SZ) = '{"*": {"installation_mode": "blocked"}}'
```
#### macOS
```
}
}
```
+### LegacyProfiles
+Disable the feature enforcing a separate profile for each installation.
+
+If this policy set to true, Firefox will not try to create different profiles for installations of Firefox in different directories. This is the equivalent of the MOZ_LEGACY_PROFILES environment variable.
+
+If this policy set to false, Firefox will create a new profile for each unique installation of Firefox.
+
+This policy only work on Windows via GPO (not policies.json).
+
+**Compatibility:** Firefox 70, Firefox ESR 68.2 (Windows only, GPO only)\
+**CCK2 Equivalent:** N/A\
+**Preferences Affected:** N/A
+
+#### Windows
+```
+Software\Policies\Mozilla\Firefox\LegacyProfiles = = 0x1 | 0x0
+```
### LocalFileLinks
Enable linking to local files by origin.
**CCK2 Equivalent:** `preferences`\
**Preferences Affected:** See below
-| Preference | Type | Compatibility
-| --- | --- | ---
-| app.update.auto | boolean | Firefox 68, Firefox 68 ESR
-| browser.cache.disk.enable | boolean | Firefox 68, Firefox 68 ESR
-| browser.cache.disk.parent_directory | string | Firefox 68, Firefox 68 ESR
-| browser.fixup.dns_first_for_single_words | boolean | Firefox 68, Firefox 68 ESR
-| browser.search.update | boolean | Firefox 68, Firefox 68 ESR
-| browser.tabs.warnOnClose | boolean | Firefox 68, Firefox 68 ESR
-| browser.urlbar.suggest.bookmark | boolean | Firefox 68, Firefox 68 ESR
-| browser.urlbar.suggest.history | boolean | Firefox 68, Firefox 68 ESR
-| browser.urlbar.suggest.openpage | boolean | Firefox 68, Firefox 68 ESR
-| datareporting.policy.dataSubmissionPolicyBypassNotification | boolean | Firefox 68, Firefox 68 ESR
-| dom.disable_window_flip | boolean | Firefox 68, Firefox 68 ESR
-| dom.disable_window_move_resize | boolean | Firefox 68, Firefox 68 ESR
-| dom.event.contextmenu.enabled | boolean | Firefox 68, Firefox 68 ESR
-| dom.keyboardevent.keypress.hack.dispatch_non_printable_keys.addl | string | Firefox 68, Firefox 68 ESR
-| dom.keyboardevent.keypress.hack.use_legacy_keycode_and_charcode.addl | string | Firefox 68, Firefox 68 ESR
-| extensions.getAddons.showPane | boolean | Firefox 68, Firefox 68 ESR
-| media.gmp-gmpopenh264.enabled | boolean | Firefox 68, Firefox 68 ESR
-| media.gmp-widevinecdm.enabled | boolean | Firefox 68, Firefox 68 ESR
-| network.dns.disableIPv6 | boolean | Firefox 68, Firefox 68 ESR
-| network.IDN_show_punycode | boolean | Firefox 68, Firefox 68 ESR
-| places.history.enabled | boolean | Firefox 68, Firefox 68 ESR
-| security.default_personal_cert | string | Firefox 68, Firefox 68 ESR
-| security.ssl.errorReporting.enabled | boolean | Firefox 68, Firefox 68 ESR
-| ui.key.menuAccessKeyFocuses | boolean | Firefox 68, Firefox 68 ESR
+| Preference | Type | Compatibility | Default
+| --- | --- | --- | ---
+| app.update.auto | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, Firefox doesn't automatically install update.
+| browser.cache.disk.enable | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, don't store cache on the hard drive.
+| browser.cache.disk.parent_directory | string | Firefox 68, Firefox 68 ESR | Profile temporary directory
+| If set, changes the location of the disk cache.
+| browser.fixup.dns_first_for_single_words | boolean | Firefox 68, Firefox 68 ESR | false
+| If true, single words are sent to DNS, not directly to search.
+| browser.search.update | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, updates for search engines are not checked.
+| browser.tabs.warnOnClose | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, there is no warning when the browser is closed.
+| browser.urlbar.suggest.bookmark | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, bookmarks aren't suggested when typing in the URL bar.
+| browser.urlbar.suggest.history | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, history isn't suggested when typing in the URL bar.
+| browser.urlbar.suggest.openpage | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, open tabs aren't suggested when typing in the URL bar.
+| datareporting.policy.dataSubmissionPolicyBypassNotification | boolean | Firefox 68, Firefox 68 ESR | false
+| If true, don't show the privacy policy tab on first run.
+| dom.disable_window_flip | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, web pages can focus and activate windows.
+| dom.disable_window_move_resize | boolean | Firefox 68, Firefox 68 ESR | false
+| If true, web pages can't move or resize windows.
+| dom.event.contextmenu.enabled | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, web pages can't override context menus.
+| dom.keyboardevent.keypress.hack.dispatch_non_printable_keys.addl | string | Firefox 68, Firefox 68 ESR | N/A
+| See https://support.mozilla.org/en-US/kb/dom-events-changes-introduced-firefox-66
+| dom.keyboardevent.keypress.hack.use_legacy_keycode_and_charcode.addl | string | Firefox 68, Firefox 68 ESR | N/A
+| See https://support.mozilla.org/en-US/kb/dom-events-changes-introduced-firefox-66
+| extensions.getAddons.showPane | boolean | Firefox 68, Firefox 68 ESR | N/A
+| If false, the Recommendations tab is not displayed in the Add-ons Manager.
+| media.gmp-gmpopenh264.enabled | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, the OpenH264 plugin is not downloaded.
+| media.gmp-widevinecdm.enabled | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, the Widevine plugin is not downloaded.
+| network.dns.disableIPv6 | boolean | Firefox 68, Firefox 68 ESR | false
+| If true, IPv6 DNS lokoups are disabled.
+| network.IDN_show_punycode | boolean | Firefox 68, Firefox 68 ESR | false
+| If true, display the punycode version of internationalized domain names.
+| places.history.enabled | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, history is not enabled.
+| security.default_personal_cert | string | Firefox 68, Firefox 68 ESR | Ask Every Time
+| If set to Select Automatically, Firefox automatically chooses the default personal certificate.
+| security.ssl.errorReporting.enabled | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, SSL errors cannot be sent to Mozilla.
+| ui.key.menuAccessKeyFocuses | boolean | Firefox 68, Firefox 68 ESR | true
+| If false, the Alt key doesn't show the menubar on Windows.
#### Windows
```
Software\Policies\Mozilla\Firefox\Preferences\boolean_preference_name = 0x1 | 0x0
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
**CCK2 Equivalent:** `defaultSearchEngine`\
**Preferences Affected:** N/A
-### Windows
+#### Windows
```
Software\Policies\Mozilla\Firefox\SearchEngines\Default = NAME_OF_SEARCH_ENGINE
```
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
**CCK2 Equivalent:** `disableSearchEngineInstall`\
**Preferences Affected:** N/A
-### Windows
+#### Windows
```
Software\Policies\Mozilla\Firefox\SearchEngines\PreventInstalls = 0x1 | 0x0
```
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
**CCK2 Equivalent:** `removeDefaultSearchEngines` (removed all built-in engines)\
**Preferences Affected:** N/A
-### Windows
+#### Windows
```
Software\Policies\Mozilla\Firefox\SearchEngines\Remove\1 = NAME_OF_SEARCH_ENGINE
```
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
**Preferences Affected:** N/A
#### Windows
+```
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\Name = "Example1"
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\URLTemplate = "https://www.example.org/q={searchTerms}"
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\Method = "GET" | "POST"
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\Description = "Example Description"
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\SuggestURLTemplate = "https://www.example.org/suggestions/q={searchTerms}"
Software\Policies\Mozilla\Firefox\SearchEngines\Add\1\PostData = "name=value&q={searchTerms}"
+```
#### macOS
```
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
**CCK2 Equivalent:** N/A\
**Preferences Affected:** `browser.urlbar.suggest.searches`,`browser.search.suggest.enabled`
-### Windows
+#### Windows
```
Software\Policies\Mozilla\Firefox\SearchSuggestEnabled = 0x1 | 0x0
```
<true/> | <false/>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
```
Software\Policies\Mozilla\Firefox\SupportMenu\Title = "Support Menu"
Software\Policies\Mozilla\Firefox\SupportMenu\URL = "http://example.com/support"
-Software\Policies\Mozilla\Firefox\SupportMenu\Title = "S"
+Software\Policies\Mozilla\Firefox\SupportMenu\AccessKey = "S"
```
#### macOS
```
</dict>
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {
</dict>
```
-### JSON
+#### JSON
```
{
"policies": {