diff --git a/src/components/script/dom/bindings/codegen/Bindings.conf b/src/components/script/dom/bindings/codegen/Bindings.conf
index 6fc67b5aab5..f8119bc71f5 100644
--- a/src/components/script/dom/bindings/codegen/Bindings.conf
+++ b/src/components/script/dom/bindings/codegen/Bindings.conf
@@ -15,14 +15,10 @@
 
 DOMInterfaces = {
 
-'DedicatedWorkerGlobalScope': {
-    'createGlobal': True,
-},
 'EventListener': {
     'nativeType': 'EventListenerBinding::EventListener',
 },
 'Window': {
-    'createGlobal': True,
     'outerObjectHook': 'Some(bindings::utils::outerize_global)',
 },
 
diff --git a/src/components/script/dom/bindings/codegen/CodegenRust.py b/src/components/script/dom/bindings/codegen/CodegenRust.py
index 9a02b2531eb..f356c9b8ee6 100644
--- a/src/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/src/components/script/dom/bindings/codegen/CodegenRust.py
@@ -1399,7 +1399,7 @@ class CGDOMJSClass(CGThing):
 
     def define(self):
         traceHook = "Some(%s)" % TRACE_HOOK_NAME
-        if self.descriptor.createGlobal:
+        if self.descriptor.isGlobal():
             flags = "JSCLASS_IS_GLOBAL | JSCLASS_DOM_GLOBAL"
             slots = "JSCLASS_GLOBAL_SLOT_COUNT + 1"
         else:
@@ -1759,7 +1759,7 @@ class CGAbstractMethod(CGThing):
 def CreateBindingJSObject(descriptor, parent=None):
     create = "let mut raw: JS<%s> = JS::from_raw(&*aObject);\n" % descriptor.concreteType
     if descriptor.proxy:
-        assert not descriptor.createGlobal
+        assert not descriptor.isGlobal()
         create += """
 let handler = RegisterBindings::proxy_handlers[PrototypeList::proxies::%s as uint];
 let mut private = PrivateValue(squirrel_away_unique(aObject) as *const libc::c_void);
@@ -1773,7 +1773,7 @@ assert!(obj.is_not_null());
 
 """ % (descriptor.name, parent)
     else:
-        if descriptor.createGlobal:
+        if descriptor.isGlobal():
             create += "let obj = CreateDOMGlobal(aCx, &Class.base as *const js::Class as *const JSClass);\n"
         else:
             create += ("let obj = with_compartment(aCx, proto, || {\n"
@@ -1793,7 +1793,7 @@ class CGWrapMethod(CGAbstractMethod):
     """
     def __init__(self, descriptor):
         assert not descriptor.interface.isCallback()
-        if not descriptor.createGlobal:
+        if not descriptor.isGlobal():
             args = [Argument('*mut JSContext', 'aCx'), Argument('&GlobalRef', 'aScope'),
                     Argument("Box<%s>" % descriptor.concreteType, 'aObject', mutable=True)]
         else:
@@ -1803,7 +1803,7 @@ class CGWrapMethod(CGAbstractMethod):
         CGAbstractMethod.__init__(self, descriptor, 'Wrap', retval, args, pub=True)
 
     def definition_body(self):
-        if not self.descriptor.createGlobal:
+        if not self.descriptor.isGlobal():
             return CGGeneric("""\
 let scope = aScope.reflector().get_jsobject();
 assert!(scope.is_not_null());
diff --git a/src/components/script/dom/bindings/codegen/Configuration.py b/src/components/script/dom/bindings/codegen/Configuration.py
index ea193d18d7a..2ef74d03bda 100644
--- a/src/components/script/dom/bindings/codegen/Configuration.py
+++ b/src/components/script/dom/bindings/codegen/Configuration.py
@@ -155,7 +155,6 @@ class Descriptor(DescriptorProvider):
         self.memberType = "Root<'a, 'b, %s>" % ifaceName
         self.nativeType = desc.get('nativeType', 'JS<%s>' % ifaceName)
         self.concreteType = desc.get('concreteType', ifaceName)
-        self.createGlobal = desc.get('createGlobal', False)
         self.register = desc.get('register', True)
         self.outerObjectHook = desc.get('outerObjectHook', 'None')
 
@@ -281,6 +280,15 @@ class Descriptor(DescriptorProvider):
         maybeAppendInfallibleToAttrs(attrs, throws)
         return attrs
 
+    def isGlobal(self):
+        """
+        Returns true if this is the primary interface for a global object
+        of some sort.
+        """
+        return (self.interface.getExtendedAttribute("Global") or
+                self.interface.getExtendedAttribute("PrimaryGlobal"))
+
+
 # Some utility methods
 def getTypesFromDescriptor(descriptor):
     """
diff --git a/src/components/script/dom/webidls/Window.webidl b/src/components/script/dom/webidls/Window.webidl
index 2992abb507c..8571f9c9b64 100644
--- a/src/components/script/dom/webidls/Window.webidl
+++ b/src/components/script/dom/webidls/Window.webidl
@@ -4,7 +4,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // http://www.whatwg.org/html/#window
-//[PrimaryGlobal]
+[PrimaryGlobal]
 /*sealed*/ interface Window : EventTarget {
   // the current browsing context
   //[Unforgeable] readonly attribute WindowProxy window;