diff --git a/browser/devtools/shared/test/unit/test_advanceValidate.js b/browser/devtools/shared/test/unit/test_advanceValidate.js
index bbffe726b9aa..9bc54b167577 100644
--- a/browser/devtools/shared/test/unit/test_advanceValidate.js
+++ b/browser/devtools/shared/test/unit/test_advanceValidate.js
@@ -10,7 +10,7 @@
 const Cu = Components.utils;
 const Ci = Components.interfaces;
 let {require} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
-let {_advanceValidate} = require("devtools/styleinspector/rule-view");
+let {advanceValidate} = require("devtools/styleinspector/utils");
 
 //                            1         2         3
 //                  0123456789012345678901234567890
@@ -18,8 +18,8 @@ let sampleInput = '\\symbol "string" url(somewhere)';
 
 function testInsertion(where, result, testName) {
   do_print(testName);
-  equal(_advanceValidate(Ci.nsIDOMKeyEvent.DOM_VK_SEMICOLON, sampleInput, where),
-        result, "testing _advanceValidate at " + where);
+  equal(advanceValidate(Ci.nsIDOMKeyEvent.DOM_VK_SEMICOLON, sampleInput, where),
+        result, "testing advanceValidate at " + where);
 }
 
 function run_test() {
diff --git a/browser/devtools/styleinspector/computed-view.js b/browser/devtools/styleinspector/computed-view.js
index 5661494218c0..2e04531d55f4 100644
--- a/browser/devtools/styleinspector/computed-view.js
+++ b/browser/devtools/styleinspector/computed-view.js
@@ -15,8 +15,10 @@ const ToolDefinitions = require("main").Tools;
 const {CssLogic} = require("devtools/styleinspector/css-logic");
 const {ELEMENT_STYLE} = require("devtools/server/actors/styles");
 const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+const {setTimeout, clearTimeout} = Cu.import("resource://gre/modules/Timer.jsm", {});
 const {OutputParser} = require("devtools/output-parser");
 const {PrefObserver, PREF_ORIG_SOURCES} = require("devtools/styleeditor/utils");
+const {createChild} = require("devtools/styleinspector/utils");
 const {gDevTools} = Cu.import("resource:///modules/devtools/gDevTools.jsm", {});
 
 loader.lazyRequireGetter(this, "overlays",
@@ -70,7 +72,7 @@ UpdateProcess.prototype = {
     if (this.canceled) {
       return;
     }
-    this._timeout = this.win.setTimeout(this._timeoutHandler.bind(this), 0);
+    this._timeout = setTimeout(this._timeoutHandler.bind(this), 0);
   },
 
   /**
@@ -79,7 +81,7 @@ UpdateProcess.prototype = {
    */
   cancel: function() {
     if (this._timeout) {
-      this.win.clearTimeout(this._timeout);
+      clearTimeout(this._timeout);
       this._timeout = 0;
     }
     this.canceled = true;
@@ -515,17 +517,15 @@ CssComputedView.prototype = {
    * Called when the user enters a search term in the filter style search box.
    */
   _onFilterStyles: function() {
-    let win = this.styleWindow;
-
     if (this._filterChangedTimeout) {
-      win.clearTimeout(this._filterChangedTimeout);
+      clearTimeout(this._filterChangedTimeout);
     }
 
     let filterTimeout = (this.searchField.value.length > 0)
       ? FILTER_CHANGED_TIMEOUT : 0;
     this.searchClearButton.hidden = this.searchField.value.length === 0;
 
-    this._filterChangedTimeout = win.setTimeout(() => {
+    this._filterChangedTimeout = setTimeout(() => {
       if (this.searchField.value.length > 0) {
         this.searchField.setAttribute("filled", true);
       } else {
@@ -1397,32 +1397,5 @@ SelectorView.prototype = {
   }
 };
 
-/**
- * Create a child element with a set of attributes.
- *
- * @param {Element} parent
- *        The parent node.
- * @param {String} tag
- *        The tag name.
- * @param {Object} attributes
- *        A set of attributes to set on the node.
- */
-function createChild(parent, tag, attributes={}) {
-  let elt = parent.ownerDocument.createElementNS(HTML_NS, tag);
-  for (let attr in attributes) {
-    if (attributes.hasOwnProperty(attr)) {
-      if (attr === "textContent") {
-        elt.textContent = attributes[attr];
-      } else if (attr === "child") {
-        elt.appendChild(attributes[attr]);
-      } else {
-        elt.setAttribute(attr, attributes[attr]);
-      }
-    }
-  }
-  parent.appendChild(elt);
-  return elt;
-}
-
 exports.CssComputedView = CssComputedView;
 exports.PropertyView = PropertyView;
diff --git a/browser/devtools/styleinspector/moz.build b/browser/devtools/styleinspector/moz.build
index e50d91589b86..b0ffaa71c3ea 100644
--- a/browser/devtools/styleinspector/moz.build
+++ b/browser/devtools/styleinspector/moz.build
@@ -14,4 +14,5 @@ EXTRA_JS_MODULES.devtools.styleinspector += [
     'style-inspector-menu.js',
     'style-inspector-overlays.js',
     'style-inspector.js',
+    'utils.js',
 ]
diff --git a/browser/devtools/styleinspector/rule-view.js b/browser/devtools/styleinspector/rule-view.js
index f420ff306ffc..315275d75255 100644
--- a/browser/devtools/styleinspector/rule-view.js
+++ b/browser/devtools/styleinspector/rule-view.js
@@ -12,6 +12,8 @@
 
 const {Cc, Ci, Cu} = require("chrome");
 const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+const {setTimeout, clearTimeout} =
+      Cu.import("resource://gre/modules/Timer.jsm", {});
 const {CssLogic} = require("devtools/styleinspector/css-logic");
 const {InplaceEditor, editableField, editableItem} =
       require("devtools/shared/inplace-editor");
@@ -19,6 +21,14 @@ const {ELEMENT_STYLE, PSEUDO_ELEMENTS} =
       require("devtools/server/actors/styles");
 const {OutputParser} = require("devtools/output-parser");
 const {PrefObserver, PREF_ORIG_SOURCES} = require("devtools/styleeditor/utils");
+const {
+  createChild,
+  appendText,
+  advanceValidate,
+  blurOnMultipleProperties,
+  promiseWarn,
+  throttle
+} = require("devtools/styleinspector/utils");
 const {
   parseDeclarations,
   parseSingleValue,
@@ -27,7 +37,6 @@ const {
   SELECTOR_ELEMENT,
   SELECTOR_PSEUDO_CLASS
 } = require("devtools/styleinspector/css-parsing-utils");
-
 loader.lazyRequireGetter(this, "overlays",
   "devtools/styleinspector/style-inspector-overlays");
 loader.lazyRequireGetter(this, "EventEmitter",
@@ -53,11 +62,6 @@ const FILTER_PROP_RE = /\s*([^:\s]*)\s*:\s*(.*?)\s*;?$/;
 const IOService = Cc["@mozilla.org/network/io-service;1"]
                   .getService(Ci.nsIIOService);
 
-function promiseWarn(err) {
-  console.error(err);
-  return promise.reject(err);
-}
-
 /**
  * To figure out how shorthand properties are interpreted by the
  * engine, we will set properties on a dummy element and observe
@@ -3642,77 +3646,6 @@ UserProperties.prototype = {
  * Helper functions
  */
 
-/**
- * Create a child element with a set of attributes.
- *
- * @param {Element} parent
- *        The parent node.
- * @param {String} tag
- *        The tag name.
- * @param {Object} attributes
- *        A set of attributes to set on the node.
- */
-function createChild(parent, tag, attributes) {
-  let elt = parent.ownerDocument.createElementNS(HTML_NS, tag);
-  for (let attr in attributes) {
-    if (attributes.hasOwnProperty(attr)) {
-      if (attr === "textContent") {
-        elt.textContent = attributes[attr];
-      } else if (attr === "child") {
-        elt.appendChild(attributes[attr]);
-      } else {
-        elt.setAttribute(attr, attributes[attr]);
-      }
-    }
-  }
-  parent.appendChild(elt);
-  return elt;
-}
-
-function setTimeout() {
-  let window = Services.appShell.hiddenDOMWindow;
-  return window.setTimeout.apply(window, arguments);
-}
-
-function clearTimeout() {
-  let window = Services.appShell.hiddenDOMWindow;
-  return window.clearTimeout.apply(window, arguments);
-}
-
-function throttle(func, wait, scope) {
-  let timer = null;
-  return function() {
-    if (timer) {
-      clearTimeout(timer);
-    }
-    let args = arguments;
-    timer = setTimeout(function() {
-      timer = null;
-      func.apply(scope, args);
-    }, wait);
-  };
-}
-
-/**
- * Event handler that causes a blur on the target if the input has
- * multiple CSS properties as the value.
- */
-function blurOnMultipleProperties(e) {
-  setTimeout(() => {
-    let props = parseDeclarations(e.target.value);
-    if (props.length > 1) {
-      e.target.blur();
-    }
-  }, 0);
-}
-
-/**
- * Append a text node to an element.
- */
-function appendText(aParent, aText) {
-  aParent.appendChild(aParent.ownerDocument.createTextNode(aText));
-}
-
 /**
  * Walk up the DOM from a given node until a parent property holder is found.
  * For elements inside the computed property list, the non-computed parent
@@ -3781,51 +3714,6 @@ function getPropertyNameAndValue(node) {
   }
 }
 
-/**
- * Called when a character is typed in a value editor.  This decides
- * whether to advance or not, first by checking to see if ";" was
- * typed, and then by lexing the input and seeing whether the ";"
- * would be a terminator at this point.
- *
- * @param {Number} keyCode
- *        Key code to be checked.
- * @param {String} value
- *        Current text editor value.
- * @param {Number} insertionPoint
- *        The index of the insertion point.
- * @return {Boolean} True if the focus should advance; false if
- *        the character should be inserted.
- */
-function advanceValidate(keyCode, value, insertionPoint) {
-  // Only ";" has special handling here.
-  if (keyCode !== Ci.nsIDOMKeyEvent.DOM_VK_SEMICOLON) {
-    return false;
-  }
-
-  // Insert the character provisionally and see what happens.  If we
-  // end up with a ";" symbol token, then the semicolon terminates the
-  // value.  Otherwise it's been inserted in some spot where it has a
-  // valid meaning, like a comment or string.
-  value = value.slice(0, insertionPoint) + ";" +
-    value.slice(insertionPoint);
-  let lexer = domUtils.getCSSLexer(value);
-  while (true) {
-    let token = lexer.nextToken();
-    if (token.endOffset > insertionPoint) {
-      if (token.tokenType === "symbol" && token.text === ";") {
-        // The ";" is a terminator.
-        return true;
-      }
-      // The ";" is not a terminator in this context.
-      break;
-    }
-  }
-  return false;
-}
-
-// We're exporting _advanceValidate for unit tests.
-exports._advanceValidate = advanceValidate;
-
 XPCOMUtils.defineLazyGetter(this, "clipboardHelper", function() {
   return Cc["@mozilla.org/widget/clipboardhelper;1"]
     .getService(Ci.nsIClipboardHelper);
diff --git a/browser/devtools/styleinspector/utils.js b/browser/devtools/styleinspector/utils.js
new file mode 100644
index 000000000000..5085ac0e4fe9
--- /dev/null
+++ b/browser/devtools/styleinspector/utils.js
@@ -0,0 +1,166 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* global domUtils */
+
+"use strict";
+
+const {Cc, Ci, Cu} = require("chrome");
+const {setTimeout, clearTimeout} =
+      Cu.import("resource://gre/modules/Timer.jsm", {});
+const {parseDeclarations} =
+      require("devtools/styleinspector/css-parsing-utils");
+const {Promise: promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
+
+loader.lazyServiceGetter(this, "domUtils",
+  "@mozilla.org/inspector/dom-utils;1", "inIDOMUtils");
+
+const HTML_NS = "http://www.w3.org/1999/xhtml";
+
+/**
+ * Create a child element with a set of attributes.
+ *
+ * @param {Element} parent
+ *        The parent node.
+ * @param {string} tagName
+ *        The tag name.
+ * @param {object} attributes
+ *        A set of attributes to set on the node.
+ */
+function createChild(parent, tagName, attributes={}) {
+  let elt = parent.ownerDocument.createElementNS(HTML_NS, tagName);
+  for (let attr in attributes) {
+    if (attributes.hasOwnProperty(attr)) {
+      if (attr === "textContent") {
+        elt.textContent = attributes[attr];
+      } else if (attr === "child") {
+        elt.appendChild(attributes[attr]);
+      } else {
+        elt.setAttribute(attr, attributes[attr]);
+      }
+    }
+  }
+  parent.appendChild(elt);
+  return elt;
+}
+
+exports.createChild = createChild;
+
+/**
+ * Append a text node to an element.
+ *
+ * @param {Element} parent
+ *        The parent node.
+ * @param {string} text
+ *        The text content for the text node.
+ */
+function appendText(parent, text) {
+  parent.appendChild(parent.ownerDocument.createTextNode(text));
+}
+
+exports.appendText = appendText;
+
+/**
+ * Called when a character is typed in a value editor.  This decides
+ * whether to advance or not, first by checking to see if ";" was
+ * typed, and then by lexing the input and seeing whether the ";"
+ * would be a terminator at this point.
+ *
+ * @param {number} keyCode
+ *        Key code to be checked.
+ * @param {string} aValue
+ *        Current text editor value.
+ * @param {number} insertionPoint
+ *        The index of the insertion point.
+ * @return {Boolean} True if the focus should advance; false if
+ *        the character should be inserted.
+ */
+function advanceValidate(keyCode, value, insertionPoint) {
+  // Only ";" has special handling here.
+  if (keyCode !== Ci.nsIDOMKeyEvent.DOM_VK_SEMICOLON) {
+    return false;
+  }
+
+  // Insert the character provisionally and see what happens.  If we
+  // end up with a ";" symbol token, then the semicolon terminates the
+  // value.  Otherwise it's been inserted in some spot where it has a
+  // valid meaning, like a comment or string.
+  value = value.slice(0, insertionPoint) + ";" + value.slice(insertionPoint);
+  let lexer = domUtils.getCSSLexer(value);
+  while (true) {
+    let token = lexer.nextToken();
+    if (token.endOffset > insertionPoint) {
+      if (token.tokenType === "symbol" && token.text === ";") {
+        // The ";" is a terminator.
+        return true;
+      }
+      // The ";" is not a terminator in this context.
+      break;
+    }
+  }
+  return false;
+}
+
+exports.advanceValidate = advanceValidate;
+
+/**
+ * Create a throttling function wrapper to regulate its frequency.
+ *
+ * @param {Function} func
+ *         The function to throttle
+ * @param {number} wait
+ *         The throttling period
+ * @param {Object} scope
+ *         The scope to use for func
+ * @return {Function} The throttled function
+ */
+function throttle(func, wait, scope) {
+  let timer = null;
+
+  return function() {
+    if (timer) {
+      clearTimeout(timer);
+    }
+
+    let args = arguments;
+    timer = setTimeout(function() {
+      timer = null;
+      func.apply(scope, args);
+    }, wait);
+  };
+}
+
+exports.throttle = throttle;
+
+/**
+ * Event handler that causes a blur on the target if the input has
+ * multiple CSS properties as the value.
+ */
+function blurOnMultipleProperties(e) {
+  setTimeout(() => {
+    let props = parseDeclarations(e.target.value);
+    if (props.length > 1) {
+      e.target.blur();
+    }
+  }, 0);
+}
+
+exports.blurOnMultipleProperties = blurOnMultipleProperties;
+
+/**
+ * Log the provided error to the console and return a rejected Promise for
+ * this error.
+ *
+ * @param {Error} error
+ *         The error to log
+ * @return {Promise} A rejected promise
+ */
+function promiseWarn(error) {
+  console.error(error);
+  return promise.reject(error);
+}
+
+exports.promiseWarn = promiseWarn;