diff --git a/dom/base/Navigator.cpp b/dom/base/Navigator.cpp
index 11b4444bef5a..31b7d9d45324 100644
--- a/dom/base/Navigator.cpp
+++ b/dom/base/Navigator.cpp
@@ -2183,33 +2183,6 @@ Navigator::HasWakeLockSupport(JSContext* /* unused*/, JSObject* /*unused */)
   return !!pmService;
 }
 
-/* static */
-bool
-Navigator::HasMobileMessageSupport(JSContext* /* unused */, JSObject* aGlobal)
-{
-  nsCOMPtr<nsPIDOMWindow> win = GetWindowFromGlobal(aGlobal);
-
-#ifndef MOZ_WEBSMS_BACKEND
-  return false;
-#endif
-
-  // First of all, the general pref has to be turned on.
-  bool enabled = false;
-  Preferences::GetBool("dom.sms.enabled", &enabled);
-  if (!enabled) {
-    return false;
-  }
-
-  NS_ENSURE_TRUE(win, false);
-  NS_ENSURE_TRUE(win->GetDocShell(), false);
-
-  if (!CheckPermission(win, "sms")) {
-    return false;
-  }
-
-  return true;
-}
-
 /* static */
 bool
 Navigator::HasCameraSupport(JSContext* /* unused */, JSObject* aGlobal)
@@ -2255,16 +2228,6 @@ Navigator::HasNFCSupport(JSContext* /* unused */, JSObject* aGlobal)
 }
 #endif // MOZ_NFC
 
-#ifdef MOZ_TIME_MANAGER
-/* static */
-bool
-Navigator::HasTimeSupport(JSContext* /* unused */, JSObject* aGlobal)
-{
-  nsCOMPtr<nsPIDOMWindow> win = GetWindowFromGlobal(aGlobal);
-  return win && CheckPermission(win, "time");
-}
-#endif // MOZ_TIME_MANAGER
-
 #ifdef MOZ_MEDIA_NAVIGATOR
 /* static */
 bool
@@ -2366,22 +2329,6 @@ Navigator::HasDataStoreSupport(JSContext* aCx, JSObject* aGlobal)
   return HasDataStoreSupport(doc->NodePrincipal());
 }
 
-/* static */
-bool
-Navigator::HasNetworkStatsSupport(JSContext* /* unused */, JSObject* aGlobal)
-{
-  nsCOMPtr<nsPIDOMWindow> win = GetWindowFromGlobal(aGlobal);
-  return CheckPermission(win, "networkstats-manage");
-}
-
-/* static */
-bool
-Navigator::HasFeatureDetectionSupport(JSContext* /* unused */, JSObject* aGlobal)
-{
-  nsCOMPtr<nsPIDOMWindow> win = GetWindowFromGlobal(aGlobal);
-  return CheckPermission(win, "feature-detection");
-}
-
 #ifdef MOZ_B2G
 /* static */
 bool
diff --git a/dom/base/Navigator.h b/dom/base/Navigator.h
index bfcd23cb17f4..c841f59455e9 100644
--- a/dom/base/Navigator.h
+++ b/dom/base/Navigator.h
@@ -268,8 +268,6 @@ public:
 
   // WebIDL helper methods
   static bool HasWakeLockSupport(JSContext* /* unused*/, JSObject* /*unused */);
-  static bool HasMobileMessageSupport(JSContext* /* unused */,
-                                      JSObject* aGlobal);
   static bool HasCameraSupport(JSContext* /* unused */,
                                JSObject* aGlobal);
   static bool HasWifiManagerSupport(JSContext* /* unused */,
@@ -277,9 +275,6 @@ public:
 #ifdef MOZ_NFC
   static bool HasNFCSupport(JSContext* /* unused */, JSObject* aGlobal);
 #endif // MOZ_NFC
-#ifdef MOZ_TIME_MANAGER
-  static bool HasTimeSupport(JSContext* /* unused */, JSObject* aGlobal);
-#endif // MOZ_TIME_MANAGER
 #ifdef MOZ_MEDIA_NAVIGATOR
   static bool HasUserMediaSupport(JSContext* /* unused */,
                                   JSObject* /* unused */);
@@ -291,10 +286,6 @@ public:
 
   static bool HasDataStoreSupport(JSContext* cx, JSObject* aGlobal);
 
-  static bool HasNetworkStatsSupport(JSContext* aCx, JSObject* aGlobal);
-
-  static bool HasFeatureDetectionSupport(JSContext* aCx, JSObject* aGlobal);
-
 #ifdef MOZ_B2G
   static bool HasMobileIdSupport(JSContext* aCx, JSObject* aGlobal);
 #endif
diff --git a/dom/webidl/MozNetworkStats.webidl b/dom/webidl/MozNetworkStats.webidl
index 5e71732c67d6..fdb6d8f40da5 100644
--- a/dom/webidl/MozNetworkStats.webidl
+++ b/dom/webidl/MozNetworkStats.webidl
@@ -26,8 +26,8 @@ dictionary NetworkStatsAlarmOptions
 
 [JSImplementation="@mozilla.org/networkstats;1",
  ChromeOnly,
- Pref="dom.mozNetworkStats.enabled",
- Func="Navigator::HasNetworkStatsSupport"]
+ CheckPermissions="networkstats-manage",
+ Pref="dom.mozNetworkStats.enabled"]
 interface MozNetworkStats {
   /**
    * App manifest URL of an application for specifying the per-app stats of the
diff --git a/dom/webidl/MozNetworkStatsAlarm.webidl b/dom/webidl/MozNetworkStatsAlarm.webidl
index dd2a4fb8ffad..a363288a5457 100644
--- a/dom/webidl/MozNetworkStatsAlarm.webidl
+++ b/dom/webidl/MozNetworkStatsAlarm.webidl
@@ -4,8 +4,8 @@
 
 [JSImplementation="@mozilla.org/networkstatsalarm;1",
  ChromeOnly,
- Pref="dom.mozNetworkStats.enabled",
- Func="Navigator::HasNetworkStatsSupport"]
+ CheckPermissions="networkstats-manage",
+ Pref="dom.mozNetworkStats.enabled"]
 interface MozNetworkStatsAlarm {
   readonly attribute unsigned long alarmId;
   readonly attribute MozNetworkStatsInterface network;
diff --git a/dom/webidl/MozNetworkStatsData.webidl b/dom/webidl/MozNetworkStatsData.webidl
index 0c4799417872..894e95b2f7be 100644
--- a/dom/webidl/MozNetworkStatsData.webidl
+++ b/dom/webidl/MozNetworkStatsData.webidl
@@ -4,8 +4,8 @@
 
 [JSImplementation="@mozilla.org/networkStatsdata;1",
  ChromeOnly,
- Pref="dom.mozNetworkStats.enabled",
- Func="Navigator::HasNetworkStatsSupport"]
+ CheckPermissions="networkstats-manage",
+ Pref="dom.mozNetworkStats.enabled"]
 interface MozNetworkStatsData {
   readonly attribute unsigned long   rxBytes;   // Received bytes.
   readonly attribute unsigned long   txBytes;   // Sent bytes.
diff --git a/dom/webidl/MozNetworkStatsInterface.webidl b/dom/webidl/MozNetworkStatsInterface.webidl
index 8221ab962cb6..1eb14c18e33a 100644
--- a/dom/webidl/MozNetworkStatsInterface.webidl
+++ b/dom/webidl/MozNetworkStatsInterface.webidl
@@ -12,8 +12,8 @@ dictionary NetworkInterface {
  */
 [Constructor(optional NetworkInterface networkinterface),
  JSImplementation="@mozilla.org/networkstatsinterface;1",
- Pref="dom.mozNetworkStats.enabled",
- Func="Navigator::HasNetworkStatsSupport"]
+ CheckPermissions="networkstats-manage",
+ Pref="dom.mozNetworkStats.enabled"]
 interface MozNetworkStatsInterface {
   readonly attribute long type;
 
diff --git a/dom/webidl/Navigator.webidl b/dom/webidl/Navigator.webidl
index 18a45860537a..6cb56e03bb45 100644
--- a/dom/webidl/Navigator.webidl
+++ b/dom/webidl/Navigator.webidl
@@ -83,7 +83,7 @@ interface NavigatorStorageUtils {
 
 [NoInterfaceObject]
 interface NavigatorFeatures {
-  [Func="Navigator::HasFeatureDetectionSupport"]
+  [CheckPermissions="feature-detection"]
   Promise getFeature(DOMString name);
 };
 
@@ -252,10 +252,12 @@ partial interface Navigator {
   boolean mozIsLocallyAvailable(DOMString uri, boolean whenOffline);
 };
 
+#ifdef MOZ_WEBSMS_BACKEND
 partial interface Navigator {
-  [Func="Navigator::HasMobileMessageSupport"]
+  [CheckPermissions="sms", Pref="dom.sms.enabled"]
   readonly attribute MozMobileMessageManager? mozMobileMessage;
 };
+#endif
 
 // NetworkInformation
 partial interface Navigator {
@@ -331,7 +333,7 @@ partial interface Navigator {
 #ifdef MOZ_TIME_MANAGER
 // nsIDOMMozNavigatorTime
 partial interface Navigator {
-  [Throws, Func="Navigator::HasTimeSupport"]
+  [Throws, CheckPermissions="time"]
   readonly attribute MozTimeManager mozTime;
 };
 #endif // MOZ_TIME_MANAGER