diff --git a/notebook/extensions.py b/notebook/extensions.py
index f906c1e4c5..1f8e64d8d6 100644
--- a/notebook/extensions.py
+++ b/notebook/extensions.py
@@ -58,6 +58,7 @@ class BaseExtensionApp(JupyterApp):
 
     user = Bool(False, config=True, help="Whether to do a user install")
     sys_prefix = Bool(False, config=True, help="Use the sys.prefix as the prefix")
+    all = Bool(False, config=True, help="Whether to do both a user and sys.prefix install")
     python = Bool(False, config=True, help="Install from a Python package")
 
     # Remove for 5.0...
@@ -71,6 +72,11 @@ def _verbose_changed(self):
     def _log_format_default(self):
         """A default format for messages"""
         return "%(message)s"
+        
+    def start(self):
+        if self.all:
+            self.user = True
+            self.sys_prefix = True
 
 def _get_config_dir(user=False, sys_prefix=False):
     """Get the location of config files for the current context
diff --git a/notebook/nbextensions.py b/notebook/nbextensions.py
index b22fbefda1..69b8f186ad 100644
--- a/notebook/nbextensions.py
+++ b/notebook/nbextensions.py
@@ -671,6 +671,8 @@ def install_extensions(self):
 
     def start(self):
         """Perform the App's function as configured"""
+        super(InstallNBExtensionApp, self).start()
+        
         if not self.extra_args:
             sys.exit('Please specify an nbextension to install')
         else:
@@ -736,6 +738,8 @@ def uninstall_extensions(self):
             uninstall_nbextension(self.extra_args[0], **kwargs)
     
     def start(self):
+        super(UninstallNBExtensionApp, self).start()
+        
         if not self.extra_args:
             sys.exit('Please specify an nbextension to uninstall')
         else:
@@ -800,6 +804,8 @@ def toggle_nbextension(self, require):
                       logger=self.log)
         
     def start(self):
+        super(ToggleNBExtensionApp, self).start()
+
         if not self.extra_args:
             sys.exit('Please specify an nbextension/package to enable or disable')
         elif len(self.extra_args) > 1:
@@ -869,6 +875,8 @@ def list_nbextensions(self):
     
     def start(self):
         """Perform the App's functions as configured"""
+        super(ListNBExtensionsApp, self).start()
+        
         self.list_nbextensions()
 
 
diff --git a/notebook/serverextensions.py b/notebook/serverextensions.py
index 9889c702bc..28166f76e3 100644
--- a/notebook/serverextensions.py
+++ b/notebook/serverextensions.py
@@ -203,6 +203,8 @@ def toggle_server_extension_python(self, package):
 
     def start(self):
         """Perform the App's actions as configured"""
+        super(ToggleServerExtensionApp, self).start()
+        
         if not self.extra_args:
             sys.exit('Please specify a server extension/package to enable or disable')
         for arg in self.extra_args:
@@ -265,6 +267,8 @@ def list_server_extensions(self):
 
     def start(self):
         """Perform the App's actions as configured"""
+        super(ListServerExtensionsApp, self).start()
+        
         self.list_server_extensions()