diff --git a/utils/prototypes.js b/utils/prototypes.js
new file mode 100644
index 0000000..5c853e1
--- /dev/null
+++ b/utils/prototypes.js
@@ -0,0 +1,64 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// TODO: https://github.com/MozillaSecurity/octo/issues/7
+
+if (!String.fromCodePoint) {
+  String.fromCodePoint = function fromCodePoint() {
+    var chars = [], point, offset, units, i;
+    for (i = 0; i < arguments.length; ++i) {
+      point = arguments[i];
+      offset = point - 0x10000;
+      units = point > 0xFFFF ? [0xD800 + (offset >> 10), 0xDC00 + (offset & 0x3FF)] : [point];
+      chars.push(String.fromCharCode.apply(null, units));
+    }
+    return chars.join("");
+  }
+}
+
+if (!String.prototype.endsWith) {
+  String.prototype.endsWith = function (str) { return (this.match(str + "$") == str) };
+}
+
+if (!String.prototype.startsWith) {
+  String.prototype.startsWith = function (str) {
+    return (this.match("^" + str) == str)
+  };
+}
+
+if (!String.prototype.trim) {
+  String.prototype.trim = function () {
+    return (this.replace(/^[\s\xA0]+/, "").replace(/[\s\xA0]+$/, ""))
+  };
+}
+
+if (!String.prototype.insert) {
+  String.prototype.insert = function (data, idx) {
+    return this.slice(0, idx) + data + this.slice(idx, this.length);
+  };
+}
+
+if (!Array.prototype.has) {
+  Array.prototype.has = function (v) {
+    return this.indexOf(v) != -1;
+  };
+}
+
+if (!Array.prototype.forEach) {
+  Array.prototype.forEach = function (array, fn) {
+    for (var i = 0; i < array.length; i++) {
+      fn(array[i]);
+    }
+  }
+}
+
+if (!Array.prototype.map) {
+  Array.prototype.map = function (fn, array) {
+    var result = [];
+    Array.forEach(array, function (element) {
+      result.push(fn(element));
+    });
+    return result;
+  }
+}