Add missing "use strict" pragmas.

common/content/abbreviations.js

@@ -4,7 +4,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
-
+"use strict";
 
 /** @scope modules */
 

melodactyl/content/config.js

@@ -4,7 +4,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
-
+"use strict";
 
 Components.utils.import("resource://gre/modules/utils.js"); // XXX
 

melodactyl/content/library.js

@@ -3,7 +3,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
-
+"use strict";
 
 // TODO: flesh this out
 const Library = Module("library", {

melodactyl/content/player.js

@@ -3,7 +3,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
-
+"use strict";
 
 const Player = Module("player", {
     init: function init() {

pentadactyl/content/config.js

@@ -4,6 +4,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
+"use strict";
 
 const Config = Module("config", ConfigBase, {
     get visualbellWindow() getBrowser().mPanelContainer,

teledactyl/content/addressbook.js

@@ -2,6 +2,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
+"use strict";
 
 const Addressbook = Module("addressbook", {
     init: function () {

teledactyl/content/compose/compose.js

@@ -2,6 +2,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
+"use strict";
 
 function Compose() { //{{{
     ////////////////////////////////////////////////////////////////////////////////

teledactyl/content/config.js

@@ -2,6 +2,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
+"use strict";
 
 const Config = Module("config", ConfigBase, {
     init: function init() {

teledactyl/content/mail.js

@@ -2,6 +2,7 @@
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
+"use strict";
 
 const Mail = Module("mail", {
     init: function () {