diff --git a/extensions/launch-new-instance/extension.js b/extensions/launch-new-instance/extension.js
index 07830c59..0cbc49d4 100644
--- a/extensions/launch-new-instance/extension.js
+++ b/extensions/launch-new-instance/extension.js
@@ -2,9 +2,6 @@ const AppDisplay = imports.ui.appDisplay;
 
 let _activateOriginal = null;
 
-function init() {
-}
-
 function enable() {
   _activateOriginal = AppDisplay.AppIcon.prototype.activate;
   AppDisplay.AppIcon.prototype.activate = function() {
diff --git a/extensions/native-window-placement/extension.js b/extensions/native-window-placement/extension.js
index 5c6c9d83..4b9fba30 100644
--- a/extensions/native-window-placement/extension.js
+++ b/extensions/native-window-placement/extension.js
@@ -284,7 +284,3 @@ function disable() {
     global.stage.queue_relayout();
     resetState();
 }
-
-function init() {
-    /* do nothing */
-}
diff --git a/extensions/screenshot-window-sizer/extension.js b/extensions/screenshot-window-sizer/extension.js
index 5aa6b1d8..e97d2d98 100644
--- a/extensions/screenshot-window-sizer/extension.js
+++ b/extensions/screenshot-window-sizer/extension.js
@@ -136,9 +136,6 @@ function cycleScreenshotSizes(display, window, binding) {
     flashMessage(message);
 }
 
-function init() {
-}
-
 function enable() {
     Main.wm.addKeybinding('cycle-screenshot-sizes',
                           Convenience.getSettings(),
diff --git a/extensions/windowsNavigator/extension.js b/extensions/windowsNavigator/extension.js
index 16ed85d1..4777e94e 100644
--- a/extensions/windowsNavigator/extension.js
+++ b/extensions/windowsNavigator/extension.js
@@ -284,7 +284,3 @@ function disable() {
 
     resetState();
 }
-
-function init() {
-    /* do nothing */
-}