diff --git a/components/script/dom/webidls/Bluetooth.webidl b/components/script/dom/webidls/Bluetooth.webidl
index e2a7bb57130..4199e0bc486 100644
--- a/components/script/dom/webidls/Bluetooth.webidl
+++ b/components/script/dom/webidls/Bluetooth.webidl
@@ -4,6 +4,7 @@
 
 // https://webbluetoothcg.github.io/web-bluetooth/#bluetooth
 
+[Pref="dom.bluetooth.enabled"]
 interface Bluetooth {
     // Promise<BluetoothDevice> requestDevice(RequestDeviceOptions options);
     BluetoothDevice? requestDevice(/*RequestDeviceOptions options*/);
diff --git a/components/script/dom/webidls/BluetoothAdvertisingData.webidl b/components/script/dom/webidls/BluetoothAdvertisingData.webidl
index e49024df669..27583a95e4e 100644
--- a/components/script/dom/webidls/BluetoothAdvertisingData.webidl
+++ b/components/script/dom/webidls/BluetoothAdvertisingData.webidl
@@ -12,6 +12,7 @@ interface BluetoothServiceDataMap {
   readonly maplike<UUID, DataView>;
 };*/
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothAdvertisingData {
   readonly attribute unsigned short? appearance;
   readonly attribute byte? txPower;
diff --git a/components/script/dom/webidls/BluetoothCharacteristicProperties.webidl b/components/script/dom/webidls/BluetoothCharacteristicProperties.webidl
index 9e7e2bb3831..381ee568462 100644
--- a/components/script/dom/webidls/BluetoothCharacteristicProperties.webidl
+++ b/components/script/dom/webidls/BluetoothCharacteristicProperties.webidl
@@ -4,6 +4,7 @@
 
 // https://webbluetoothcg.github.io/web-bluetooth/#characteristicproperties
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothCharacteristicProperties {
     readonly attribute boolean broadcast;
     readonly attribute boolean read;
diff --git a/components/script/dom/webidls/BluetoothDevice.webidl b/components/script/dom/webidls/BluetoothDevice.webidl
index 1c0c56cd1e7..3a32dc38179 100644
--- a/components/script/dom/webidls/BluetoothDevice.webidl
+++ b/components/script/dom/webidls/BluetoothDevice.webidl
@@ -10,6 +10,7 @@ enum VendorIDSource {
     "usb"
 };
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothDevice {
     readonly attribute DOMString id;
     readonly attribute DOMString? name;
diff --git a/components/script/dom/webidls/BluetoothRemoteGATTCharacteristic.webidl b/components/script/dom/webidls/BluetoothRemoteGATTCharacteristic.webidl
index 2648d0bf654..e6ba9c89d2a 100644
--- a/components/script/dom/webidls/BluetoothRemoteGATTCharacteristic.webidl
+++ b/components/script/dom/webidls/BluetoothRemoteGATTCharacteristic.webidl
@@ -4,6 +4,7 @@
 
 // https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattcharacteristic
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothRemoteGATTCharacteristic {
   readonly attribute BluetoothRemoteGATTService service;
   readonly attribute DOMString uuid;
diff --git a/components/script/dom/webidls/BluetoothRemoteGATTDescriptor.webidl b/components/script/dom/webidls/BluetoothRemoteGATTDescriptor.webidl
index dc367a5fe8e..c7abe9e4859 100644
--- a/components/script/dom/webidls/BluetoothRemoteGATTDescriptor.webidl
+++ b/components/script/dom/webidls/BluetoothRemoteGATTDescriptor.webidl
@@ -4,6 +4,7 @@
 
 // http://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattdescriptor
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothRemoteGATTDescriptor {
   readonly attribute BluetoothRemoteGATTCharacteristic characteristic;
   readonly attribute DOMString uuid;
diff --git a/components/script/dom/webidls/BluetoothRemoteGATTServer.webidl b/components/script/dom/webidls/BluetoothRemoteGATTServer.webidl
index 8d360a7b31a..327542b522f 100644
--- a/components/script/dom/webidls/BluetoothRemoteGATTServer.webidl
+++ b/components/script/dom/webidls/BluetoothRemoteGATTServer.webidl
@@ -4,6 +4,7 @@
 
 //https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattserver
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothRemoteGATTServer {
   readonly attribute BluetoothDevice device;
   readonly attribute boolean connected;
diff --git a/components/script/dom/webidls/BluetoothRemoteGATTService.webidl b/components/script/dom/webidls/BluetoothRemoteGATTService.webidl
index 63ae0e090a5..e8d66f6ac63 100644
--- a/components/script/dom/webidls/BluetoothRemoteGATTService.webidl
+++ b/components/script/dom/webidls/BluetoothRemoteGATTService.webidl
@@ -4,6 +4,7 @@
 
 // https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattservice
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothRemoteGATTService {
     readonly attribute BluetoothDevice device;
     readonly attribute DOMString uuid;
diff --git a/components/script/dom/webidls/BluetoothUUID.webidl b/components/script/dom/webidls/BluetoothUUID.webidl
index 00421cde65a..fb0bad5451e 100644
--- a/components/script/dom/webidls/BluetoothUUID.webidl
+++ b/components/script/dom/webidls/BluetoothUUID.webidl
@@ -4,6 +4,7 @@
 
 // https://webbluetoothcg.github.io/web-bluetooth/#bluetoothuuid
 
+[Pref="dom.bluetooth.enabled"]
 interface BluetoothUUID {
     [Throws]
     static UUID getService(BluetoothServiceUUID name);
diff --git a/components/script/dom/webidls/TestBinding.webidl b/components/script/dom/webidls/TestBinding.webidl
index aec682bc307..4b4265f326a 100644
--- a/components/script/dom/webidls/TestBinding.webidl
+++ b/components/script/dom/webidls/TestBinding.webidl
@@ -72,7 +72,8 @@ dictionary TestDictionaryDefaults {
 
 [Constructor,
  Constructor(sequence<unrestricted double> numberSequence),
-  Constructor(unrestricted double num)]
+ Constructor(unrestricted double num),
+ Pref="dom.testbinding.enabled"]
 interface TestBinding {
            attribute boolean booleanAttribute;
            attribute byte byteAttribute;
diff --git a/components/script/dom/webidls/TestBindingProxy.webidl b/components/script/dom/webidls/TestBindingProxy.webidl
index 121ea1a3da8..61ef19db296 100644
--- a/components/script/dom/webidls/TestBindingProxy.webidl
+++ b/components/script/dom/webidls/TestBindingProxy.webidl
@@ -11,6 +11,7 @@
 // This interface is entirely internal to Servo, and should not be accessible to
 // web pages.
 
+[Pref="dom.testbinding.enabled"]
 interface TestBindingProxy : TestBinding {
   readonly attribute unsigned long length;
 
diff --git a/tests/wpt/mozilla/meta/mozilla/preferences.html.ini b/tests/wpt/mozilla/meta/mozilla/preferences.html.ini
index dad937dd5a9..83de4dd69cd 100644
--- a/tests/wpt/mozilla/meta/mozilla/preferences.html.ini
+++ b/tests/wpt/mozilla/meta/mozilla/preferences.html.ini
@@ -1,3 +1,3 @@
 [preferences.html]
   type: testharness
-  prefs: [dom.testbinding.preference_value.falsy:false, dom.testbinding.preference_value.truthy:true, dom.testbinding.preference_value.string_empty:, dom.testbinding.preference_value.string_test:test, dom.testbinding.preference_value.space_string_test:test1 test2, dom.testbinding.preference_value.quote_string_test:"test1 test2"]
+  prefs: [dom.testbinding.enabled:true, dom.testbinding.preference_value.falsy:false, dom.testbinding.preference_value.truthy:true, dom.testbinding.preference_value.string_empty:, dom.testbinding.preference_value.string_test:test, dom.testbinding.preference_value.space_string_test:test1 test2, dom.testbinding.preference_value.quote_string_test:"test1 test2"]
diff --git a/tests/wpt/mozilla/meta/mozilla/sequence-hole.html.ini b/tests/wpt/mozilla/meta/mozilla/sequence-hole.html.ini
new file mode 100644
index 00000000000..e3da43f8d3b
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/sequence-hole.html.ini
@@ -0,0 +1,3 @@
+[sequence-hole.html]
+  type: testharness
+  prefs: [dom.testbinding.enabled:true]
diff --git a/tests/wpt/mozilla/meta/mozilla/variadic-interface.html.ini b/tests/wpt/mozilla/meta/mozilla/variadic-interface.html.ini
new file mode 100644
index 00000000000..f21720b9363
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/variadic-interface.html.ini
@@ -0,0 +1,3 @@
+[variadic-interface.html]
+  type: testharness
+  prefs: [dom.testbinding.enabled:true]
diff --git a/tests/wpt/mozilla/meta/mozilla/weakref.html.ini b/tests/wpt/mozilla/meta/mozilla/weakref.html.ini
new file mode 100644
index 00000000000..3c694147814
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/weakref.html.ini
@@ -0,0 +1,3 @@
+[weakref.html]
+  type: testharness
+  prefs: [dom.testbinding.enabled:true]
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index 31495c457f0..e8dde3e906c 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -74,15 +74,6 @@ var ecmaGlobals = [
 var interfaceNamesInGlobalScope = [
   "Attr",
   "Blob",
-  "Bluetooth",
-  "BluetoothAdvertisingData",
-  "BluetoothCharacteristicProperties",
-  "BluetoothDevice",
-  "BluetoothRemoteGATTCharacteristic",
-  "BluetoothRemoteGATTDescriptor",
-  "BluetoothRemoteGATTServer",
-  "BluetoothRemoteGATTService",
-  "BluetoothUUID",
   "CanvasGradient",
   "CanvasRenderingContext2D",
   "CanvasPattern",
@@ -215,8 +206,6 @@ var interfaceNamesInGlobalScope = [
   "StorageEvent",
   "StyleSheet",
   "StyleSheetList",
-  "TestBinding", // XXX
-  "TestBindingProxy", // XXX
   "Text",
   "TextDecoder",
   "TextEncoder",