diff --git a/lib/utils/prototypes.js b/lib/utils/prototypes.js
index e50d95c..5fa890a 100644
--- a/lib/utils/prototypes.js
+++ b/lib/utils/prototypes.js
@@ -3,73 +3,51 @@
  * 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/. */
 
-Object.defineProperty(String.prototype, 'fromCodePoint', function () {
-  let chars = []
-  let 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('')
-})
+const utils = require('../utils')
 
-Object.defineProperty(String.prototype, 'endsWith', function (str) {
-  return this.match(str + '$') === str
-})
-
-Object.defineProperty(String.prototype, 'startsWith', function (str) {
-  return this.match('^' + str) === str
-})
-
-Object.defineProperty(String.prototype, 'trim', function () {
-  return this.replace(/^[\s\xA0]+/, '').replace(/[\s\xA0]+$/, '')
-})
-
-Object.defineProperty(String.prototype, 'insert', function (data, idx) {
-  return this.slice(0, idx) + data + this.slice(idx, this.length)
-})
-
-Object.defineProperty(Array.prototype, 'has', function (v) {
-  return this.indexOf(v) !== -1
-})
-
-Object.defineProperty(Array.prototype, 'forEach', function (array, fn) {
-  for (let i = 0; i < array.length; i++) {
-    fn(array[i])
-  }
-})
-
-Object.defineProperty(Array.prototype, 'map', function (fn, array) {
-  let result = []
-  Array.forEach(array, function (element) {
-    result.push(fn(element))
-  })
-  return result
-})
-
-Object.defineProperty(Array.prototype, 'extend', {
-  value: function (obj) {
-    if (Array.isArray(obj)) {
-      obj.forEach(function (v) {
-        if (typeof v !== 'undefined') {
-          this.push(v)
+class prototypes extends utils {
+  static enable () {
+    if (!String.prototype.hasOwnProperty('insert')) {
+      Object.defineProperty(String.prototype, 'insert', {
+        value: function (data, i) {
+          return this.slice(0, i) + data + this.slice(i, this.length)
         }
-      }, this)
-    } else {
-      this.push(obj)
+      })
+    }
+
+    if (!Array.prototype.hasOwnProperty('has')) {
+      Object.defineProperty(Array.prototype, 'has', {
+        value: function (v) {
+          return this.indexOf(v) !== -1
+        }
+      })
+    }
+
+    if (!Array.prototype.hasOwnProperty('extend')) {
+      Object.defineProperty(Array.prototype, 'extend', {
+        value: function (obj) {
+          if (Array.isArray(obj)) {
+            obj.forEach(function (v) {
+              if (typeof v !== 'undefined') {
+                this.push(v)
+              }
+            }, this)
+          } else {
+            this.push(obj)
+          }
+        }
+      })
+    }
+
+    if (!Object.hasOwnProperty('isObject')) {
+      Object.defineProperty(Object, 'isObject', {
+        value: function (obj) {
+          return (obj !== null && typeof obj === 'object' &&
+            Object.prototype.toString.call(obj) === '[object Object]')
+        }
+      })
     }
   }
-})
+}
 
-Object.defineProperty(Object, 'isObject', {
-  value: function (obj) {
-    return (obj !== null && typeof obj === 'object' &&
-    Object.prototype.toString.call(obj) === '[object Object]')
-  }
-})
+module.exports = prototypes
diff --git a/package.json b/package.json
index 2f167c0..6411f15 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mozillasecurity/octo",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "description": "",
   "keywords": [
     "fuzzing",