diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index e4b30bf3703e..aa9f364d2f82 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1008,9 +1008,6 @@ pref("devtools.inspector.enabled", true);
 // Enable the style inspector
 pref("devtools.styleinspector.enabled", true);
 
-// Enable the rules view
-pref("devtools.ruleview.enabled", true);
-
 // Enable the Scratchpad tool.
 pref("devtools.scratchpad.enabled", true);
 
diff --git a/browser/devtools/highlighter/inspector.jsm b/browser/devtools/highlighter/inspector.jsm
index 0985befbb69c..a6021ea8e4b3 100644
--- a/browser/devtools/highlighter/inspector.jsm
+++ b/browser/devtools/highlighter/inspector.jsm
@@ -50,7 +50,6 @@ var EXPORTED_SYMBOLS = ["InspectorUI"];
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource:///modules/TreePanel.jsm");
-Cu.import("resource:///modules/devtools/CssRuleView.jsm");
 
 const INSPECTOR_INVISIBLE_ELEMENTS = {
   "head": true,
@@ -741,7 +740,6 @@ InspectorUI.prototype = {
   toolEvents: null,
   inspecting: false,
   treePanelEnabled: true,
-  ruleViewEnabled: true,
   isDirty: false,
   store: null,
 
@@ -893,11 +891,6 @@ InspectorUI.prototype = {
       this.treePanel = new TreePanel(this.chromeWin, this);
     }
 
-    if (Services.prefs.getBoolPref("devtools.ruleview.enabled") &&
-        !this.toolRegistered("ruleview")) {
-      this.registerRuleView();
-    }
-
     if (Services.prefs.getBoolPref("devtools.styleinspector.enabled") &&
         !this.toolRegistered("styleinspector")) {
       this.stylePanel = new StyleInspector(this.chromeWin, this);
@@ -917,28 +910,6 @@ InspectorUI.prototype = {
     this.initializeHighlighter();
   },
 
-  registerRuleView: function IUI_registerRuleView()
-  {
-    let isOpen = this.isRuleViewOpen.bind(this);
-
-    this.ruleViewObject = {
-      id: "ruleview",
-      label: this.strings.GetStringFromName("ruleView.label"),
-      tooltiptext: this.strings.GetStringFromName("ruleView.tooltiptext"),
-      accesskey: this.strings.GetStringFromName("ruleView.accesskey"),
-      context: this,
-      get isOpen() isOpen(),
-      show: this.openRuleView,
-      hide: this.closeRuleView,
-      onSelect: this.selectInRuleView,
-      panel: null,
-      unregister: this.destroyRuleView,
-      sidebar: true,
-    };
-
-    this.registerTool(this.ruleViewObject);
-  },
-
   /**
    * Register and initialize any included tools.
    */
@@ -1300,80 +1271,6 @@ InspectorUI.prototype = {
     }
   },
 
-  /////////////////////////////////////////////////////////////////////////
-  //// CssRuleView methods
-
-  /**
-   * Is the cssRuleView open?
-   */
-  isRuleViewOpen: function IUI_isRuleViewOpen()
-  {
-    return this.isSidebarOpen && this.ruleButton.hasAttribute("checked") &&
-      (this.sidebarDeck.selectedPanel == this.getToolIframe(this.ruleViewObject));
-  },
-
-  /**
-   * Convenience getter to retrieve the Rule Button.
-   */
-  get ruleButton()
-  {
-    return this.chromeDoc.getElementById(
-      this.getToolbarButtonId(this.ruleViewObject.id));
-  },
-
-  /**
-   * Open the CssRuleView.
-   */
-  openRuleView: function IUI_openRuleView()
-  {
-    let iframe = this.getToolIframe(this.ruleViewObject);
-    let boundLoadListener = function() {
-      iframe.removeEventListener("load", boundLoadListener, true);
-      let doc = iframe.contentDocument;
-      this.ruleView = new CssRuleView(doc);
-      let body = doc.getElementById("ruleview-body");
-      body.appendChild(this.ruleView.element);
-      this.ruleView.highlight(this.selection);
-    }.bind(this);
-
-    iframe.addEventListener("load", boundLoadListener, true);
-
-    iframe.setAttribute("src", "chrome://browser/content/cssruleview.xhtml");
-  },
-
-  /**
-   * Stub to Close the CSS Rule View. Does nothing currently because the
-   * Rule View lives in the sidebar.
-   */
-  closeRuleView: function IUI_closeRuleView()
-  {
-    // do nothing for now
-  },
-
-  /**
-   * Update the selected node in the Css Rule View.
-   * @param {nsIDOMnode} the selected node.
-   */
-  selectInRuleView: function IUI_selectInRuleView(aNode)
-  {
-    if (this.ruleView)
-      this.ruleView.highlight(aNode);
-  },
-
-  /**
-   * Destroy the rule view.
-   */
-  destroyRuleView: function IUI_destroyRuleView()
-  {
-    let iframe = this.getToolIframe(this.ruleViewObject);
-    iframe.parentNode.removeChild(iframe);
-
-    if (this.ruleView) {
-      this.ruleView.clear();
-      delete this.ruleView;
-    }
-  },
-
   /////////////////////////////////////////////////////////////////////////
   //// Utility Methods
 
@@ -1657,7 +1554,7 @@ InspectorUI.prototype = {
     this.bindToolEvent(btn, "click", function showIframe() {
       let visible = this.sidebarDeck.selectedPanel == iframe;
       if (!visible) {
-        this.sidebarDeck.selectedPanel = iframe;
+        sidebarDeck.selectedPanel = iframe;
       }
       this.toolShow(aRegObj);
     }.bind(this));
diff --git a/browser/devtools/highlighter/test/browser_inspector_initialization.js b/browser/devtools/highlighter/test/browser_inspector_initialization.js
index e56cdfaeeb9b..4bffe770c277 100644
--- a/browser/devtools/highlighter/test/browser_inspector_initialization.js
+++ b/browser/devtools/highlighter/test/browser_inspector_initialization.js
@@ -95,34 +95,22 @@ function treePanelTests()
 
   executeSoon(function() {
     InspectorUI.showSidebar();
-    document.getElementById(InspectorUI.getToolbarButtonId("styleinspector")).click();
   });
 }
 
 function stylePanelTests()
 {
   Services.obs.removeObserver(stylePanelTests, "StyleInspector-opened");
+  Services.obs.addObserver(runContextMenuTest,
+    InspectorUI.INSPECTOR_NOTIFICATIONS.CLOSED, false);
 
   ok(InspectorUI.isSidebarOpen, "Inspector Sidebar is open");
   ok(InspectorUI.stylePanel.cssHtmlTree, "Style Panel has a cssHtmlTree");
 
-  InspectorUI.ruleButton.click();
-  executeSoon(function() {
-    ruleViewTests();
-  });
-}
-
-function ruleViewTests()
-{
-  Services.obs.addObserver(runContextMenuTest,
-      InspectorUI.INSPECTOR_NOTIFICATIONS.CLOSED, false);
-
-  ok(InspectorUI.isRuleViewOpen(), "Rule View is open");
-  ok(InspectorUI.ruleView, "InspectorUI has a cssRuleView");
-
   executeSoon(function() {
     InspectorUI.closeInspectorUI();
   });
+
 }
 
 function runContextMenuTest()
@@ -205,10 +193,6 @@ function finishInspectorTests()
   ok(!InspectorUI.treePanel, "Inspector Tree Panel is closed");
   ok(!InspectorUI.inspecting, "Inspector is not inspecting");
   ok(!InspectorUI.isSidebarOpen, "Inspector Sidebar is closed");
-  ok(!InspectorUI.stylePanel, "Inspector Style Panel is gone");
-  ok(!InspectorUI.ruleView, "Inspector Rule View is gone");
-  is(InspectorUI.sidebarToolbar.children.length, 0, "No items in the Sidebar toolbar");
-  is(InspectorUI.sidebarDeck.children.length, 0, "No items in the Sidebar deck");
   ok(!InspectorUI.toolbar, "toolbar is hidden");
 
   gBrowser.removeCurrentTab();
diff --git a/browser/locales/en-US/chrome/browser/devtools/inspector.properties b/browser/locales/en-US/chrome/browser/devtools/inspector.properties
index f265cda6f39f..6f5bb87a9c82 100644
--- a/browser/locales/en-US/chrome/browser/devtools/inspector.properties
+++ b/browser/locales/en-US/chrome/browser/devtools/inspector.properties
@@ -23,8 +23,3 @@ htmlPanel.tooltiptext=HTML panel
 # toolbar button.
 htmlPanel.accesskey=H
 
-# LOCALIZATION NOTE (ruleView.*): Button label, accesskey and tooltip text
-# associated with the Highlighter's CSS Rule View in the Style Sidebar.
-ruleView.label=Rules
-ruleView.accesskey=R
-ruleView.tooltiptext=View and Edit CSS
\ No newline at end of file