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diff --git a/devtools/client/responsive.html/index.js b/devtools/client/responsive.html/index.js
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index 000000000..7e8f8aeac
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+++ b/devtools/client/responsive.html/index.js
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+/* 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/. */
+
+/* eslint-env browser */
+
+"use strict";
+
+const { utils: Cu } = Components;
+const { BrowserLoader } =
+  Cu.import("resource://devtools/client/shared/browser-loader.js", {});
+const { require } = BrowserLoader({
+  baseURI: "resource://devtools/client/responsive.html/",
+  window
+});
+const { Task } = require("devtools/shared/task");
+const Telemetry = require("devtools/client/shared/telemetry");
+const { loadSheet } = require("sdk/stylesheet/utils");
+
+const { createFactory, createElement } =
+  require("devtools/client/shared/vendor/react");
+const ReactDOM = require("devtools/client/shared/vendor/react-dom");
+const { Provider } = require("devtools/client/shared/vendor/react-redux");
+
+const message = require("./utils/message");
+const App = createFactory(require("./app"));
+const Store = require("./store");
+const { changeLocation } = require("./actions/location");
+const { changeDisplayPixelRatio } = require("./actions/display-pixel-ratio");
+const { addViewport, resizeViewport } = require("./actions/viewports");
+const { loadDevices } = require("./actions/devices");
+
+// Exposed for use by tests
+window.require = require;
+
+let bootstrap = {
+
+  telemetry: new Telemetry(),
+
+  store: null,
+
+  init: Task.async(function* () {
+    // Load a special UA stylesheet to reset certain styles such as dropdown
+    // lists.
+    loadSheet(window,
+              "resource://devtools/client/responsive.html/responsive-ua.css",
+              "agent");
+    this.telemetry.toolOpened("responsive");
+    let store = this.store = Store();
+    let provider = createElement(Provider, { store }, App());
+    ReactDOM.render(provider, document.querySelector("#root"));
+    message.post(window, "init:done");
+  }),
+
+  destroy() {
+    this.store = null;
+    this.telemetry.toolClosed("responsive");
+    this.telemetry = null;
+  },
+
+  /**
+   * While most actions will be dispatched by React components, some external
+   * APIs that coordinate with the larger browser UI may also have actions to
+   * to dispatch.  They can do so here.
+   */
+  dispatch(action) {
+    if (!this.store) {
+      // If actions are dispatched after store is destroyed, ignore them.  This
+      // can happen in tests that close the tool quickly while async tasks like
+      // initDevices() below are still pending.
+      return;
+    }
+    this.store.dispatch(action);
+  },
+
+};
+
+// manager.js sends a message to signal init
+message.wait(window, "init").then(() => bootstrap.init());
+
+// manager.js sends a message to signal init is done, which can be used for delayed
+// startup work that shouldn't block initial load
+message.wait(window, "post-init").then(() => bootstrap.dispatch(loadDevices()));
+
+window.addEventListener("unload", function onUnload() {
+  window.removeEventListener("unload", onUnload);
+  bootstrap.destroy();
+});
+
+// Allows quick testing of actions from the console
+window.dispatch = action => bootstrap.dispatch(action);
+
+// Expose the store on window for testing
+Object.defineProperty(window, "store", {
+  get: () => bootstrap.store,
+  enumerable: true,
+});
+
+// Dispatch a `changeDisplayPixelRatio` action when the browser's pixel ratio is changing.
+// This is usually triggered when the user changes the monitor resolution, or when the
+// browser's window is dragged to a different display with a different pixel ratio.
+function onDPRChange() {
+  let dpr = window.devicePixelRatio;
+  let mql = window.matchMedia(`(resolution: ${dpr}dppx)`);
+
+  function listener() {
+    bootstrap.dispatch(changeDisplayPixelRatio(window.devicePixelRatio));
+    mql.removeListener(listener);
+    onDPRChange();
+  }
+
+  mql.addListener(listener);
+}
+
+/**
+ * Called by manager.js to add the initial viewport based on the original page.
+ */
+window.addInitialViewport = contentURI => {
+  try {
+    onDPRChange();
+    bootstrap.dispatch(changeLocation(contentURI));
+    bootstrap.dispatch(changeDisplayPixelRatio(window.devicePixelRatio));
+    bootstrap.dispatch(addViewport());
+  } catch (e) {
+    console.error(e);
+  }
+};
+
+/**
+ * Called by manager.js when tests want to check the viewport size.
+ */
+window.getViewportSize = () => {
+  let { width, height } = bootstrap.store.getState().viewports[0];
+  return { width, height };
+};
+
+/**
+ * Called by manager.js to set viewport size from tests, GCLI, etc.
+ */
+window.setViewportSize = ({ width, height }) => {
+  try {
+    bootstrap.dispatch(resizeViewport(0, width, height));
+  } catch (e) {
+    console.error(e);
+  }
+};
+
+/**
+ * Called by manager.js to access the viewport's browser, either for testing
+ * purposes or to reload it when touch simulation is enabled.
+ * A messageManager getter is added on the object to provide an easy access
+ * to the message manager without pulling the frame loader.
+ */
+window.getViewportBrowser = () => {
+  let browser = document.querySelector("iframe.browser");
+  if (!browser.messageManager) {
+    Object.defineProperty(browser, "messageManager", {
+      get() {
+        return this.frameLoader.messageManager;
+      },
+      configurable: true,
+      enumerable: true,
+    });
+  }
+  return browser;
+};