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diff --git a/devtools/client/framework/toolbox-hosts.js b/devtools/client/framework/toolbox-hosts.js
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+++ b/devtools/client/framework/toolbox-hosts.js
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+/* -*- 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/. */
+
+"use strict";
+
+const EventEmitter = require("devtools/shared/event-emitter");
+const promise = require("promise");
+const defer = require("devtools/shared/defer");
+const Services = require("Services");
+const {DOMHelpers} = require("resource://devtools/client/shared/DOMHelpers.jsm");
+
+loader.lazyRequireGetter(this, "system", "devtools/shared/system");
+
+/* A host should always allow this much space for the page to be displayed.
+ * There is also a min-height on the browser, but we still don't want to set
+ * frame.height to be larger than that, since it can cause problems with
+ * resizing the toolbox and panel layout. */
+const MIN_PAGE_SIZE = 25;
+
+/**
+ * A toolbox host represents an object that contains a toolbox (e.g. the
+ * sidebar or a separate window). Any host object should implement the
+ * following functions:
+ *
+ * create() - create the UI and emit a 'ready' event when the UI is ready to use
+ * destroy() - destroy the host's UI
+ */
+
+exports.Hosts = {
+  "bottom": BottomHost,
+  "side": SidebarHost,
+  "window": WindowHost,
+  "custom": CustomHost
+};
+
+/**
+ * Host object for the dock on the bottom of the browser
+ */
+function BottomHost(hostTab) {
+  this.hostTab = hostTab;
+
+  EventEmitter.decorate(this);
+}
+
+BottomHost.prototype = {
+  type: "bottom",
+
+  heightPref: "devtools.toolbox.footer.height",
+
+  /**
+   * Create a box at the bottom of the host tab.
+   */
+  create: function () {
+    let deferred = defer();
+
+    let gBrowser = this.hostTab.ownerDocument.defaultView.gBrowser;
+    let ownerDocument = gBrowser.ownerDocument;
+    this._nbox = gBrowser.getNotificationBox(this.hostTab.linkedBrowser);
+
+    this._splitter = ownerDocument.createElement("splitter");
+    this._splitter.setAttribute("class", "devtools-horizontal-splitter");
+    // Avoid resizing notification containers
+    this._splitter.setAttribute("resizebefore", "flex");
+
+    this.frame = ownerDocument.createElement("iframe");
+    this.frame.className = "devtools-toolbox-bottom-iframe";
+    this.frame.height = Math.min(
+      Services.prefs.getIntPref(this.heightPref),
+      this._nbox.clientHeight - MIN_PAGE_SIZE
+    );
+
+    this._nbox.appendChild(this._splitter);
+    this._nbox.appendChild(this.frame);
+
+    let frameLoad = () => {
+      this.emit("ready", this.frame);
+      deferred.resolve(this.frame);
+    };
+
+    this.frame.tooltip = "aHTMLTooltip";
+
+    // we have to load something so we can switch documents if we have to
+    this.frame.setAttribute("src", "about:blank");
+
+    let domHelper = new DOMHelpers(this.frame.contentWindow);
+    domHelper.onceDOMReady(frameLoad);
+
+    focusTab(this.hostTab);
+
+    return deferred.promise;
+  },
+
+  /**
+   * Raise the host.
+   */
+  raise: function () {
+    focusTab(this.hostTab);
+  },
+
+  /**
+   * Minimize this host so that only the toolbox tabbar remains visible.
+   * @param {Number} height The height to minimize to. Defaults to 0, which
+   * means that the toolbox won't be visible at all once minimized.
+   */
+  minimize: function (height = 0) {
+    if (this.isMinimized) {
+      return;
+    }
+    this.isMinimized = true;
+
+    let onTransitionEnd = event => {
+      if (event.propertyName !== "margin-bottom") {
+        // Ignore transitionend on unrelated properties.
+        return;
+      }
+
+      this.frame.removeEventListener("transitionend", onTransitionEnd);
+      this.emit("minimized");
+    };
+    this.frame.addEventListener("transitionend", onTransitionEnd);
+    this.frame.style.marginBottom = -this.frame.height + height + "px";
+    this._splitter.classList.add("disabled");
+  },
+
+  /**
+   * If the host was minimized before, maximize it again (the host will be
+   * maximized to the height it previously had).
+   */
+  maximize: function () {
+    if (!this.isMinimized) {
+      return;
+    }
+    this.isMinimized = false;
+
+    let onTransitionEnd = event => {
+      if (event.propertyName !== "margin-bottom") {
+        // Ignore transitionend on unrelated properties.
+        return;
+      }
+
+      this.frame.removeEventListener("transitionend", onTransitionEnd);
+      this.emit("maximized");
+    };
+    this.frame.addEventListener("transitionend", onTransitionEnd);
+    this.frame.style.marginBottom = "0";
+    this._splitter.classList.remove("disabled");
+  },
+
+  /**
+   * Toggle the minimize mode.
+   * @param {Number} minHeight The height to minimize to.
+   */
+  toggleMinimizeMode: function (minHeight) {
+    this.isMinimized ? this.maximize() : this.minimize(minHeight);
+  },
+
+  /**
+   * Set the toolbox title.
+   * Nothing to do for this host type.
+   */
+  setTitle: function () {},
+
+  /**
+   * Destroy the bottom dock.
+   */
+  destroy: function () {
+    if (!this._destroyed) {
+      this._destroyed = true;
+
+      Services.prefs.setIntPref(this.heightPref, this.frame.height);
+      this._nbox.removeChild(this._splitter);
+      this._nbox.removeChild(this.frame);
+      this.frame = null;
+      this._nbox = null;
+      this._splitter = null;
+    }
+
+    return promise.resolve(null);
+  }
+};
+
+/**
+ * Host object for the in-browser sidebar
+ */
+function SidebarHost(hostTab) {
+  this.hostTab = hostTab;
+
+  EventEmitter.decorate(this);
+}
+
+SidebarHost.prototype = {
+  type: "side",
+
+  widthPref: "devtools.toolbox.sidebar.width",
+
+  /**
+   * Create a box in the sidebar of the host tab.
+   */
+  create: function () {
+    let deferred = defer();
+
+    let gBrowser = this.hostTab.ownerDocument.defaultView.gBrowser;
+    let ownerDocument = gBrowser.ownerDocument;
+    this._sidebar = gBrowser.getSidebarContainer(this.hostTab.linkedBrowser);
+
+    this._splitter = ownerDocument.createElement("splitter");
+    this._splitter.setAttribute("class", "devtools-side-splitter");
+
+    this.frame = ownerDocument.createElement("iframe");
+    this.frame.className = "devtools-toolbox-side-iframe";
+
+    this.frame.width = Math.min(
+      Services.prefs.getIntPref(this.widthPref),
+      this._sidebar.clientWidth - MIN_PAGE_SIZE
+    );
+
+    this._sidebar.appendChild(this._splitter);
+    this._sidebar.appendChild(this.frame);
+
+    let frameLoad = () => {
+      this.emit("ready", this.frame);
+      deferred.resolve(this.frame);
+    };
+
+    this.frame.tooltip = "aHTMLTooltip";
+    this.frame.setAttribute("src", "about:blank");
+
+    let domHelper = new DOMHelpers(this.frame.contentWindow);
+    domHelper.onceDOMReady(frameLoad);
+
+    focusTab(this.hostTab);
+
+    return deferred.promise;
+  },
+
+  /**
+   * Raise the host.
+   */
+  raise: function () {
+    focusTab(this.hostTab);
+  },
+
+  /**
+   * Set the toolbox title.
+   * Nothing to do for this host type.
+   */
+  setTitle: function () {},
+
+  /**
+   * Destroy the sidebar.
+   */
+  destroy: function () {
+    if (!this._destroyed) {
+      this._destroyed = true;
+
+      Services.prefs.setIntPref(this.widthPref, this.frame.width);
+      this._sidebar.removeChild(this._splitter);
+      this._sidebar.removeChild(this.frame);
+    }
+
+    return promise.resolve(null);
+  }
+};
+
+/**
+ * Host object for the toolbox in a separate window
+ */
+function WindowHost() {
+  this._boundUnload = this._boundUnload.bind(this);
+
+  EventEmitter.decorate(this);
+}
+
+WindowHost.prototype = {
+  type: "window",
+
+  WINDOW_URL: "chrome://devtools/content/framework/toolbox-window.xul",
+
+  /**
+   * Create a new xul window to contain the toolbox.
+   */
+  create: function () {
+    let deferred = defer();
+
+    let flags = "chrome,centerscreen,resizable,dialog=no";
+    let win = Services.ww.openWindow(null, this.WINDOW_URL, "_blank",
+                                     flags, null);
+
+    let frameLoad = () => {
+      win.removeEventListener("load", frameLoad, true);
+      win.focus();
+
+      let key;
+      if (system.constants.platform === "macosx") {
+        key = win.document.getElementById("toolbox-key-toggle-osx");
+      } else {
+        key = win.document.getElementById("toolbox-key-toggle");
+      }
+      key.removeAttribute("disabled");
+
+      this.frame = win.document.getElementById("toolbox-iframe");
+      this.emit("ready", this.frame);
+
+      deferred.resolve(this.frame);
+    };
+
+    win.addEventListener("load", frameLoad, true);
+    win.addEventListener("unload", this._boundUnload);
+
+    this._window = win;
+
+    return deferred.promise;
+  },
+
+  /**
+   * Catch the user closing the window.
+   */
+  _boundUnload: function (event) {
+    if (event.target.location != this.WINDOW_URL) {
+      return;
+    }
+    this._window.removeEventListener("unload", this._boundUnload);
+
+    this.emit("window-closed");
+  },
+
+  /**
+   * Raise the host.
+   */
+  raise: function () {
+    this._window.focus();
+  },
+
+  /**
+   * Set the toolbox title.
+   */
+  setTitle: function (title) {
+    this._window.document.title = title;
+  },
+
+  /**
+   * Destroy the window.
+   */
+  destroy: function () {
+    if (!this._destroyed) {
+      this._destroyed = true;
+
+      this._window.removeEventListener("unload", this._boundUnload);
+      this._window.close();
+    }
+
+    return promise.resolve(null);
+  }
+};
+
+/**
+ * Host object for the toolbox in its own tab
+ */
+function CustomHost(hostTab, options) {
+  this.frame = options.customIframe;
+  this.uid = options.uid;
+  EventEmitter.decorate(this);
+}
+
+CustomHost.prototype = {
+  type: "custom",
+
+  _sendMessageToTopWindow: function (msg, data) {
+    // It's up to the custom frame owner (parent window) to honor
+    // "close" or "raise" instructions.
+    let topWindow = this.frame.ownerDocument.defaultView;
+    if (!topWindow) {
+      return;
+    }
+    let json = {name: "toolbox-" + msg, uid: this.uid};
+    if (data) {
+      json.data = data;
+    }
+    topWindow.postMessage(JSON.stringify(json), "*");
+  },
+
+  /**
+   * Create a new xul window to contain the toolbox.
+   */
+  create: function () {
+    return promise.resolve(this.frame);
+  },
+
+  /**
+   * Raise the host.
+   */
+  raise: function () {
+    this._sendMessageToTopWindow("raise");
+  },
+
+  /**
+   * Set the toolbox title.
+   */
+  setTitle: function (title) {
+    this._sendMessageToTopWindow("title", { value: title });
+  },
+
+  /**
+   * Destroy the window.
+   */
+  destroy: function () {
+    if (!this._destroyed) {
+      this._destroyed = true;
+      this._sendMessageToTopWindow("close");
+    }
+    return promise.resolve(null);
+  }
+};
+
+/**
+ *  Switch to the given tab in a browser and focus the browser window
+ */
+function focusTab(tab) {
+  let browserWindow = tab.ownerDocument.defaultView;
+  browserWindow.focus();
+  browserWindow.gBrowser.selectedTab = tab;
+}