diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index 8f08e4c84..311d981bb 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -130,10 +130,10 @@ class Application(QApplication):
         utilcmds.init()
         log.init.debug("Initializing cookies...")
         cookiejar = cookies.CookieJar(self)
-        self.obj.register('cookiejar', cookiejar)
+        self.obj['cookiejar'] = cookiejar
         log.init.debug("Initializing cache...")
         diskcache = cache.DiskCache(self)
-        self.obj.register('cache', diskcache)
+        self.obj['cache'] = diskcache
         log.init.debug("Initializing commands...")
         self._commandrunner = runners.CommandRunner()
         log.init.debug("Initializing search...")
@@ -757,7 +757,7 @@ class Application(QApplication):
             if hasattr(self, 'stateconfig'):
                 to_save.append(("window geometry", self.stateconfig.save))
             try:
-                cookiejar = self.obj.get('cookiejar')
+                cookiejar = self.obj['cookiejar']
             except KeyError:
                 pass
             else:
diff --git a/qutebrowser/utils/usertypes.py b/qutebrowser/utils/usertypes.py
index 7f91d1fe5..13163c741 100644
--- a/qutebrowser/utils/usertypes.py
+++ b/qutebrowser/utils/usertypes.py
@@ -24,6 +24,7 @@ Module attributes:
 """
 
 import operator
+import collections
 import collections.abc
 import enum as pyenum
 
@@ -383,7 +384,7 @@ class Timer(QTimer):
             super().start()
 
 
-class ObjectRegistry:
+class ObjectRegistry(collections.UserDict):
 
     """A registry of long-living objects in qutebrowser.
 
@@ -394,55 +395,20 @@ class ObjectRegistry:
         cache: DiskCache instance.
     """
 
-    def __init__(self):
-        self._objects = {}
-        self._objects['global'] = {}
-
-    def get(self, name, scope='global'):
-        """Get an object from the object registry.
-
-        Args:
-            name: The name of the object to get.
-            scope: The scope the object is registered in.
-
-        Return:
-            The registered object.
-        """
-        try:
-            objects = self._objects[scope]
-        except KeyError:
-            raise KeyError("Invalid scope '{}'.".format(scope))
-        try:
-            obj = objects[name]
-        except KeyError:
-            raise KeyError("No object '{}' in scope '{}'!".format(obj, scope))
-        return obj
-
-    def register(self, name, obj, scope='global'):
+    def __setitem__(self, name, obj):
         """Register an object in the object registry.
 
-        Args:
-            name: The name to register the object as.
-            obj: The object to register.
-            scope: The scope to register the object in.
+        Prevents duplicated registrations.
         """
-        if scope not in self._objects:
-            raise KeyError("Invalid scope '{}'.".format(scope))
-        if name in self._objects[scope]:
-            existing_obj = self._objects[scope][name]
+        if name in self.data:
             raise KeyError("Object '{}' is already registered in scope "
-                           "'{}' ({})!".format(name, scope, existing_obj))
-        self._objects[scope][name] = obj
+                           "'{}' ({})!".format(name, scope, self.data[name]))
+        super().__setitem__(name, obj)
 
     def dump_objects(self):
         """Dump all objects as a string."""
         lines = []
-        count = 0
-        for scope, objects in self._objects.items():
-            if objects:
-                lines.append("Scope {}:".format(scope))
-            for name, obj in objects.items():
-                lines.append("     {}: {}".format(name, repr(obj)))
-                count += 1
-        lines.insert(0, '{} qutebrowser objects:'.format(count))
+        for name, obj in self.data.items():
+            lines.append("     {}: {}".format(name, repr(obj)))
+        lines.insert(0, '{} objects:'.format(len(self.data)))
         return lines
diff --git a/qutebrowser/utils/utils.py b/qutebrowser/utils/utils.py
index 2df4aa889..6f51febfe 100644
--- a/qutebrowser/utils/utils.py
+++ b/qutebrowser/utils/utils.py
@@ -580,11 +580,11 @@ def is_enum(obj):
         return False
 
 
-def get_object(name, scope='global'):
+def get_object(name):
     """Helper function to get an object."""
-    return QCoreApplication.instance().obj.get(name, scope)
+    return QCoreApplication.instance().obj[name]
 
 
-def register_object(name, obj, scope='global'):
+def register_object(name, obj):
     """Helper function to register an object."""
-    return QCoreApplication.instance().obj.register(name, obj, scope)
+    QCoreApplication.instance().obj[name] = obj