| **[`SSLVersionMax`](#sslversionmax)** | Set and lock the maximum version of TLS.
| **[`SSLVersionMin`](#sslversionmin)** | Set and lock the minimum version of TLS.
| **[`SupportMenu`](#supportmenu)** | Add a menuitem to the help menu for specifying support information.
+| **[`UserMessaging`](#usermessaging)** | Don't show certain messages to the user.
| **[`WebsiteFilter`](#websitefilter)** | Block websites from being visited.
### AppUpdateURL
}
}
```
+### UserMessaging
+
+Prevent installing search engines from webpages.
+
+`WhatsNew` Remove the "What's New" icon and menuitem. (Firefox 75 only)
+
+`ExtensionRecommendations` Don't recommend extensions.
+
+`FeatureRecommendations` Don't recommend browser features.
+
+`UrlbarInterventions` Don't offer Firefox specific suggestions in the URL bar. (Firefox 75 only)
+
+**Compatibility:** Firefox 75, Firefox ESR 68.7\
+**CCK2 Equivalent:** N/A\
+**Preferences Affected:** `browser.messaging-system.whatsNewPanel.enabled`,`browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons`,`browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features`
+
+#### Windows (GPO)
+```
+Software\Policies\Mozilla\Firefox\UserMessaging\WhatsNew = 0x1 | 0x0
+Software\Policies\Mozilla\Firefox\UserMessaging\ExtensionRecommendations = 0x1 | 0x0
+Software\Policies\Mozilla\Firefox\UserMessaging\FeatureRecommendations = 0x1 | 0x0
+Software\Policies\Mozilla\Firefox\UserMessaging\UrlbarInterventions = 0x1 | 0x0
+```
+#### macOS
+```
+<dict>
+ <key>UserMessaging</key>
+ <dict>
+ <key>WhatsNew</key>
+ <true/> | <false/>
+ <key>ExtensionRecommendations</key>
+ <true/> | <false/>
+ <key>FeatureRecommendations</key>
+ <true/> | <false/>
+ <key>UrlbarInterventions</key>
+ <true/> | <false/>
+ </dict>
+</dict>
+```
+#### policies.json
+```
+{
+ "policies": {
+ "UserMessaging": {
+ "WhatsNew": true | false,
+ "ExtensionRecommendations": true | false,
+ "FeatureRecommendations": true | false,
+ "UrlbarInterventions": true | false
+ }
+ }
+}
+```
### WebsiteFilter
Block websites from being visited. The parameters take an array of Match Patterns, as documented in https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Match_patterns. Only http/https addresses are supported at the moment. The arrays are limited to 1000 entries each.