diff --git a/README b/README
index ee537f0a5..423943c5b 100644
--- a/README
+++ b/README
@@ -7,6 +7,14 @@ You can read more about pdf.js here:
 http://andreasgal.com/2011/06/15/pdf-js/
 http://blog.mozilla.com/cjones/2011/06/15/overview-of-pdf-js-guts/
 
-Or follow us on twitter: @pdfjs
+follow us on twitter: @pdfjs
 
 http://twitter.com/#!/pdfjs
+
+join our mailing list:
+
+dev-pdf-js@lists.mozilla.org
+
+and talk to us on IRC:
+
+#pdfjs on irc.mozilla.org
diff --git a/crypto.js b/crypto.js
index 14cc21902..e888d0212 100644
--- a/crypto.js
+++ b/crypto.js
@@ -1,5 +1,5 @@
-/* -*- Mode: Java; tab-width: s; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
-/* vim: set shiftwidth=s tabstop=2 autoindent cindent expandtab: */
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
 
 "use strict";
 
@@ -45,12 +45,12 @@ var ARCFourCipher = (function() {
 })();
 
 var md5 = (function() {
-  const r = new Uint8Array([
+  var r = new Uint8Array([
     7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
     5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,
     4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
     6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21]);
-  const k = new Int32Array([
+  var k = new Int32Array([
     -680876936, -389564586, 606105819, -1044525330, -176418897, 1200080426,
     -1473231341, -45705983, 1770035416, -1958414417, -42063, -1990404162,
     1804603682, -40341101, -1502002290, 1236535329, -165796510, -1069501632,
@@ -149,7 +149,7 @@ var CipherTransform = (function() {
 
 var CipherTransformFactory = (function() {
   function prepareKeyData(fileId, password, ownerPassword, userPassword, flags, revision, keyLength) {
-    const defaultPasswordBytes = new Uint8Array([
+    var defaultPasswordBytes = new Uint8Array([
       0x28, 0xBF, 0x4E, 0x5E, 0x4E, 0x75, 0x8A, 0x41, 0x64, 0x00, 0x4E, 0x56, 0xFF, 0xFA, 0x01, 0x08, 
       0x2E, 0x2E, 0x00, 0xB6, 0xD0, 0x68, 0x3E, 0x80, 0x2F, 0x0C, 0xA9, 0xFE, 0x64, 0x53, 0x69, 0x7A]);
     var hashData = new Uint8Array(88), i = 0, j, n;