Merge pull request #567 from mozilla/UserMessaging

Updates for new UserMessaging policy

diff --combined README.md
index 3498a8407b8bfae516b147c087e7414ac588521e,490bb5ad928a6dc4d71a8da183dae2237934a679..9dc593892fe0a6bc4b699c7f1ae09834e4a1ba45
--- 1/README.md
--- 2/README.md
+++ b/README.md
@@@ -31,7 -31,6 +31,7 @@@ Policies can be specified using the Gro
  | **[`DisableFormHistory`](#disableformhistory)** | Turn off saving information on web forms and the search bar.
  | **[`DisablePocket`](#disablepocket)** | Remove Pocket in the Firefox UI.
  | **[`DisablePrivateBrowsing`](#disableprivatebrowsing)** | Remove access to private browsing.
 +| **[`DisablePasswordReveal`](#disablepasswordreveal)** | Do not allow passwords to be revealed in saved logins.
  | **[`DisableProfileImport`](#disableprofileimport)** | Disables the "Import data from another browser" option in the bookmarks window.
  | **[`DisableProfileRefresh`](#disableprofilerefresh)** | Disable the Refresh Firefox button on about:support and support.mozilla.org
  | **[`DisableSafeMode`](#disablesafemode)** | Disable safe mode within the browser.
@@@ -84,6 -83,7 +84,7 @@@
  | **[`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
@@@ -3021,6 -3021,58 +3022,58 @@@ Software\Policies\Mozilla\Firefox\Suppo
    }
  }
  ```
+ ### 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.