diff --git a/components/script/dom/webidls/BluetoothPermissionResult.webidl b/components/script/dom/webidls/BluetoothPermissionResult.webidl
index 47d19999001..6029e0b2034 100644
--- a/components/script/dom/webidls/BluetoothPermissionResult.webidl
+++ b/components/script/dom/webidls/BluetoothPermissionResult.webidl
@@ -23,7 +23,7 @@ dictionary BluetoothPermissionData {
   required sequence<AllowedBluetoothDevice> allowedDevices/* = []*/;
 };
 
-// [Pref="dom.bluetooth.enabled"]
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothPermissionResult : PermissionStatus {
   // attribute FrozenArray<BluetoothDevice> devices;
   // Workaround until FrozenArray get implemented.
diff --git a/components/script/dom/webidls/Navigator.webidl b/components/script/dom/webidls/Navigator.webidl
index a461b01932b..e04616ef40f 100644
--- a/components/script/dom/webidls/Navigator.webidl
+++ b/components/script/dom/webidls/Navigator.webidl
@@ -66,5 +66,5 @@ partial interface Navigator {
 // https://w3c.github.io/permissions/#navigator-and-workernavigator-extension
 [Exposed=(Window)]
 partial interface Navigator {
-  readonly attribute Permissions permissions;
+  [Pref="dom.permissions.enabled"] readonly attribute Permissions permissions;
 };
diff --git a/components/script/dom/webidls/PermissionStatus.webidl b/components/script/dom/webidls/PermissionStatus.webidl
index 168d797685e..9fb1a5ce966 100644
--- a/components/script/dom/webidls/PermissionStatus.webidl
+++ b/components/script/dom/webidls/PermissionStatus.webidl
@@ -28,7 +28,7 @@ enum PermissionName {
   "persistent-storage",
 };
 
-[Exposed=(Window,Worker)]
+[Pref="dom.permissions.enabled", Exposed=(Window,Worker)]
 interface PermissionStatus : EventTarget {
   readonly attribute PermissionState state;
   attribute EventHandler onchange;
diff --git a/components/script/dom/webidls/Permissions.webidl b/components/script/dom/webidls/Permissions.webidl
index 279acb09ba3..56841956e8d 100644
--- a/components/script/dom/webidls/Permissions.webidl
+++ b/components/script/dom/webidls/Permissions.webidl
@@ -4,7 +4,7 @@
 
 // https://w3c.github.io/permissions/#permissions-interface
 
-[Exposed=(Window,Worker)]
+[Pref="dom.permissions.enabled", Exposed=(Window,Worker)]
 interface Permissions {
   Promise<PermissionStatus> query(object permissionDesc);
 
diff --git a/components/script/dom/webidls/WorkerNavigator.webidl b/components/script/dom/webidls/WorkerNavigator.webidl
index 10c258f167b..c60eda76896 100644
--- a/components/script/dom/webidls/WorkerNavigator.webidl
+++ b/components/script/dom/webidls/WorkerNavigator.webidl
@@ -13,5 +13,5 @@ WorkerNavigator implements NavigatorLanguage;
 
 [Exposed=(Worker)]
 partial interface WorkerNavigator {
-  readonly attribute Permissions permissions;
+  [Pref="dom.permissions.enabled"] readonly attribute Permissions permissions;
 };
diff --git a/resources/prefs.json b/resources/prefs.json
index 74c8fa7f9fe..2e8200d3b63 100644
--- a/resources/prefs.json
+++ b/resources/prefs.json
@@ -4,6 +4,7 @@
   "dom.forcetouch.enabled": false,
   "dom.mouseevent.which.enabled": false,
   "dom.mozbrowser.enabled": false,
+  "dom.permissions.enabled": false,
   "dom.serviceworker.timeout_seconds": 60,
   "dom.testable_crash.enabled": false,
   "dom.testbinding.enabled": false,