diff --git a/crash-reporter.js b/crash-reporter.js
index 8bf9709..c1b1f70 100644
--- a/crash-reporter.js
+++ b/crash-reporter.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var electron = require('electron');
 
 // This file should be included from the main thread and every renderer thread.
diff --git a/drag-drop-main.js b/drag-drop-main.js
index 2dc802d..79ec36f 100644
--- a/drag-drop-main.js
+++ b/drag-drop-main.js
@@ -1,9 +1,48 @@
+'use strict';
+
 var electron = require('electron');
 var app = electron.app;
 var ipc = electron.ipcMain;
 
-var argv = sliceArgv(process.argv);
 var win;
+
+function sliceArgv(argv) {
+  var count = 1;
+  // We need to determine if we were run using electron or as a system installed app.
+  if (argv[0].search('electron') >= 0) {
+    count += 1;
+  }
+  return argv.slice(count);
+}
+var argv = sliceArgv(process.argv);
+
+function processArgv(argv) {
+  var files = [];
+  argv.forEach(function(arg) {
+    if (arg.substr(0, 2) === '--') {
+      console.log('received argument', arg);
+    } else {
+      files.push(arg);
+    }
+  });
+
+  if (files.length > 0) {
+    win.webContents.send('files', files);
+  }
+}
+
+function onOpen(e, filename) {
+  e.preventDefault();
+
+  if (app.ipcReady) {
+    processArgv([ filename ]);
+  } else {
+    argv.push(filename);
+  }
+}
+app.on('open-file', onOpen);
+app.on('open-url', onOpen);
+
 function init(window) {
   if (win) {
     console.error("can't initiliaze drag-and-drop multiple times");
@@ -17,39 +56,4 @@ function init(window) {
   });
 }
 
-app.on('open-file', onOpen);
-app.on('open-url', onOpen);
-function onOpen(e, filename) {
-  e.preventDefault();
-
-  if (app.ipcReady) {
-    processArgv([ filename ]);
-  } else {
-    argv.push(filename);
-  }
-}
-function sliceArgv(argv) {
-  var count = 1;
-  // We need to determine if we were run using electron or as a system installed app.
-  if (argv[0].search('electron') >= 0) {
-    count += 1;
-  }
-  return argv.slice(count);
-}
-
-function processArgv(argv) {
-  var files = [];
-  argv.forEach(function(arg) {
-    if (arg.substr(0 ,2) == '--') {
-      console.log('received argument', arg);
-    } else {
-      files.push(arg);
-    }
-  });
-
-  if (files.length > 0) {
-    win.webContents.send('files', files);
-  }
-}
-
 module.exports.init = init;
diff --git a/drag-drop-render.js b/drag-drop-render.js
index 257daca..c4f31ed 100644
--- a/drag-drop-render.js
+++ b/drag-drop-render.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var electron = require('electron');
 var ipc = electron.ipcRenderer;
 
diff --git a/index.js b/index.js
index 542d95e..eb097aa 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var electron = require('electron');
 var app = electron.app;
 var BrowserWindow = electron.BrowserWindow;
diff --git a/menu.js b/menu.js
index 7e69df7..0eebf1b 100644
--- a/menu.js
+++ b/menu.js
@@ -1,5 +1,6 @@
+'use strict';
+
 var electron = require('electron');
-var app = electron.app;
 
 var win, menu;
 
@@ -14,25 +15,6 @@ function getMenuItem (label) {
   return menuItem || {};
 }
 
-function updateFullScreenCheckbox() {
-  getMenuItem('Full Screen').checked = win.isFullScreen();
-  win.setMenuBarVisibility(!win.isFullScreen());
-}
-function toggleFullScreen(flag) {
-  if (!win || !win.isVisible()) {
-    return;
-  }
-  if (typeof flag !== 'boolean') {
-    flag = !win.isFullScreen();
-  }
-
-  if (flag) {
-    // Fullscreen and aspect ratio do not play well together. (Mac)
-    win.setAspectRatio(0);
-  }
-  win.setFullScreen(flag);
-}
-
 // Sets whether the window should always show on top of other windows
 function toggleAlwaysOnTop(flag) {
   if (!win)  {
@@ -209,10 +191,6 @@ function init(window) {
 
   menu = electron.Menu.buildFromTemplate(template);
   electron.Menu.setApplicationMenu(menu);
-
-  win.webContents.on('dom-ready', updateFullScreenCheckbox);
-  win.on('enter-full-screen', updateFullScreenCheckbox);
-  win.on('leave-full-screen', updateFullScreenCheckbox);
 }
 
 module.exports.init = init;
diff --git a/notifications.js b/notifications.js
index 7b1b068..03da031 100644
--- a/notifications.js
+++ b/notifications.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var electron = require('electron');
 var ipc = electron.ipcRenderer;
 // This file runs in a render thread of the Electron app. It must be required (directly or
diff --git a/progress.js b/progress.js
index 8225fd0..9d2e456 100644
--- a/progress.js
+++ b/progress.js
@@ -1,23 +1,11 @@
+'use strict';
+
 var electron = require('electron');
 var app = electron.app;
 var ipc = electron.ipcMain;
 
 var win;
 
-function init(window) {
-  if (win) {
-    console.error("can't initialize badge/progress tracker multiple times");
-    return;
-  }
-  win = window;
-
-  ipc.on('notification', function (ev, count, target) {
-    updateProgress(count, target);
-    increaseBadge();
-  });
-  win.on('focus', clearBadge);
-}
-
 function increaseBadge() {
   if (!win.isFocused()) {
     app.setBadgeCount(app.getBadgeCount() + 1);
@@ -35,4 +23,18 @@ function updateProgress(count, target) {
   }
 }
 
+function init(window) {
+  if (win) {
+    console.error("can't initialize badge/progress tracker multiple times");
+    return;
+  }
+  win = window;
+
+  ipc.on('notification', function (ev, count, target) {
+    updateProgress(count, target);
+    increaseBadge();
+  });
+  win.on('focus', clearBadge);
+}
+
 module.exports.init = init;
diff --git a/startup-main.js b/startup-main.js
index 560be59..c23ff1b 100644
--- a/startup-main.js
+++ b/startup-main.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var AutoLaunch = require('auto-launch');
 var electron = require('electron');
 var app = electron.app;
@@ -18,6 +20,26 @@ var appLauncher = new AutoLaunch({
   isHidden: true
 });
 
+function install () {
+  return appLauncher
+    .isEnabled()
+    .then(function (enabled) {
+      if (!enabled) {
+        return appLauncher.enable();
+      }
+    });
+}
+
+function uninstall () {
+  return appLauncher
+    .isEnabled()
+    .then(function (enabled) {
+      if (enabled) {
+        return appLauncher.disable();
+      }
+    });
+}
+
 var win;
 function init(window) {
   if (win) {
@@ -42,26 +64,6 @@ function init(window) {
   });
 }
 
-function install () {
-  return appLauncher
-    .isEnabled()
-    .then(function (enabled) {
-      if (!enabled) {
-        return appLauncher.enable();
-      }
-    });
-}
-
-function uninstall () {
-  return appLauncher
-    .isEnabled()
-    .then(function (enabled) {
-      if (enabled) {
-        return appLauncher.disable();
-      }
-    });
-}
-
 module.exports = {
   init: init,
 };
diff --git a/startup-render.js b/startup-render.js
index 1ec7dcc..1651820 100644
--- a/startup-render.js
+++ b/startup-render.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var electron = require('electron');
 var ipc = electron.ipcRenderer;
 
diff --git a/tray.js b/tray.js
index 4aca98c..e3c2f10 100644
--- a/tray.js
+++ b/tray.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var path = require('path');
 var electron = require('electron');
 var app = electron.app;