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diff --git a/toolkit/jetpack/sdk/panel/utils.js b/toolkit/jetpack/sdk/panel/utils.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/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Cc, Ci } = require("chrome");
+const { Services } = require("resource://gre/modules/Services.jsm");
+const { setTimeout } = require("../timers");
+const { platform } = require("../system");
+const { getMostRecentBrowserWindow, getOwnerBrowserWindow,
+        getHiddenWindow, getScreenPixelsPerCSSPixel } = require("../window/utils");
+
+const { create: createFrame, swapFrameLoaders, getDocShell } = require("../frame/utils");
+const { window: addonWindow } = require("../addon/window");
+const { isNil } = require("../lang/type");
+const { data } = require('../self');
+
+const events = require("../system/events");
+
+
+const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+function calculateRegion({ position, width, height, defaultWidth, defaultHeight }, rect) {
+  position = position || {};
+
+  let x, y;
+
+  let hasTop = !isNil(position.top);
+  let hasRight = !isNil(position.right);
+  let hasBottom = !isNil(position.bottom);
+  let hasLeft = !isNil(position.left);
+  let hasWidth = !isNil(width);
+  let hasHeight = !isNil(height);
+
+  // if width is not specified by constructor or show's options, then get
+  // the default width
+  if (!hasWidth)
+    width = defaultWidth;
+
+  // if height is not specified by constructor or show's options, then get
+  // the default height
+  if (!hasHeight)
+    height = defaultHeight;
+
+  // default position is centered
+  x = (rect.right - width) / 2;
+  y = (rect.top + rect.bottom - height) / 2;
+
+  if (hasTop) {
+    y = rect.top + position.top;
+
+    if (hasBottom && !hasHeight)
+      height = rect.bottom - position.bottom - y;
+  }
+  else if (hasBottom) {
+    y = rect.bottom - position.bottom - height;
+  }
+
+  if (hasLeft) {
+    x = position.left;
+
+    if (hasRight && !hasWidth)
+      width = rect.right - position.right - x;
+  }
+  else if (hasRight) {
+    x = rect.right - width - position.right;
+  }
+
+  return {x: x, y: y, width: width, height: height};
+}
+
+function open(panel, options, anchor) {
+  // Wait for the XBL binding to be constructed
+  if (!panel.openPopup) setTimeout(open, 50, panel, options, anchor);
+  else display(panel, options, anchor);
+}
+exports.open = open;
+
+function isOpen(panel) {
+  return panel.state === "open"
+}
+exports.isOpen = isOpen;
+
+function isOpening(panel) {
+  return panel.state === "showing"
+}
+exports.isOpening = isOpening
+
+function close(panel) {
+  // Sometimes "TypeError: panel.hidePopup is not a function" is thrown
+  // when quitting the host application while a panel is visible.  To suppress
+  // these errors, check for "hidePopup" in panel before calling it.
+  // It's not clear if there's an issue or it's expected behavior.
+  // See Bug 1151796.
+
+  return panel.hidePopup && panel.hidePopup();
+}
+exports.close = close
+
+
+function resize(panel, width, height) {
+  // Resize the iframe instead of using panel.sizeTo
+  // because sizeTo doesn't work with arrow panels
+  if (panel.firstChild) {
+    panel.firstChild.style.width = width + "px";
+    panel.firstChild.style.height = height + "px";
+  }
+}
+exports.resize = resize
+
+function display(panel, options, anchor) {
+  let document = panel.ownerDocument;
+
+  let x, y;
+  let { width, height, defaultWidth, defaultHeight } = options;
+
+  let popupPosition = null;
+
+  // Panel XBL has some SDK incompatible styling decisions. We shim panel
+  // instances until proper fix for Bug 859504 is shipped.
+  shimDefaultStyle(panel);
+
+  if (!anchor) {
+    // The XUL Panel doesn't have an arrow, so the margin needs to be reset
+    // in order to, be positioned properly
+    panel.style.margin = "0";
+
+    let viewportRect = document.defaultView.gBrowser.getBoundingClientRect();
+
+    ({x, y, width, height} = calculateRegion(options, viewportRect));
+  }
+  else {
+    // The XUL Panel has an arrow, so the margin needs to be reset
+    // to the default value.
+    panel.style.margin = "";
+    let { CustomizableUI, window } = anchor.ownerDocument.defaultView;
+
+    // In Australis, widgets may be positioned in an overflow panel or the
+    // menu panel.
+    // In such cases clicking this widget will hide the overflow/menu panel,
+    // and the widget's panel will show instead.
+    // If `CustomizableUI` is not available, it means the anchor is not in a
+    // chrome browser window, and therefore there is no need for this check.
+    if (CustomizableUI) {
+      let node = anchor;
+      ({anchor} = CustomizableUI.getWidget(anchor.id).forWindow(window));
+
+      // if `node` is not the `anchor` itself, it means the widget is
+      // positioned in a panel, therefore we have to hide it before show
+      // the widget's panel in the same anchor
+      if (node !== anchor)
+        CustomizableUI.hidePanelForNode(anchor);
+    }
+
+    width = width || defaultWidth;
+    height = height || defaultHeight;
+
+    // Open the popup by the anchor.
+    let rect = anchor.getBoundingClientRect();
+
+    let zoom = getScreenPixelsPerCSSPixel(window);
+    let screenX = rect.left + window.mozInnerScreenX * zoom;
+    let screenY = rect.top + window.mozInnerScreenY * zoom;
+
+    // Set up the vertical position of the popup relative to the anchor
+    // (always display the arrow on anchor center)
+    let horizontal, vertical;
+    if (screenY > window.screen.availHeight / 2 + height)
+      vertical = "top";
+    else
+      vertical = "bottom";
+
+    if (screenY > window.screen.availWidth / 2 + width)
+      horizontal = "left";
+    else
+      horizontal = "right";
+
+    let verticalInverse = vertical == "top" ? "bottom" : "top";
+    popupPosition = vertical + "center " + verticalInverse + horizontal;
+
+    // Allow panel to flip itself if the panel can't be displayed at the
+    // specified position (useful if we compute a bad position or if the
+    // user moves the window and panel remains visible)
+    panel.setAttribute("flip", "both");
+  }
+
+  if (!panel.viewFrame) {
+    panel.viewFrame = document.importNode(panel.backgroundFrame, false);
+    panel.appendChild(panel.viewFrame);
+
+    let {privateBrowsingId} = getDocShell(panel.viewFrame).getOriginAttributes();
+    let principal = Services.scriptSecurityManager.createNullPrincipal({privateBrowsingId});
+    getDocShell(panel.viewFrame).createAboutBlankContentViewer(principal);
+  }
+
+  // Resize the iframe instead of using panel.sizeTo
+  // because sizeTo doesn't work with arrow panels
+  panel.firstChild.style.width = width + "px";
+  panel.firstChild.style.height = height + "px";
+
+  panel.openPopup(anchor, popupPosition, x, y);
+}
+exports.display = display;
+
+// This utility function is just a workaround until Bug 859504 has shipped.
+function shimDefaultStyle(panel) {
+  let document = panel.ownerDocument;
+  // Please note that `panel` needs to be part of document in order to reach
+  // it's anonymous nodes. One of the anonymous node has a big padding which
+  // doesn't work well since panel frame needs to fill all of the panel.
+  // XBL binding is a not the best option as it's applied asynchronously, and
+  // makes injected frames behave in strange way. Also this feels a lot
+  // cheaper to do.
+  ["panel-inner-arrowcontent", "panel-arrowcontent"].forEach(function(value) {
+    let node = document.getAnonymousElementByAttribute(panel, "class", value);
+      if (node) node.style.padding = 0;
+  });
+}
+
+function show(panel, options, anchor) {
+  // Prevent the panel from getting focus when showing up
+  // if focus is set to false
+  panel.setAttribute("noautofocus", !options.focus);
+
+  let window = anchor && getOwnerBrowserWindow(anchor);
+  let { document } = window ? window : getMostRecentBrowserWindow();
+  attach(panel, document);
+
+  open(panel, options, anchor);
+}
+exports.show = show
+
+function onPanelClick(event) {
+  let { target, metaKey, ctrlKey, shiftKey, button } = event;
+  let accel = platform === "darwin" ? metaKey : ctrlKey;
+  let isLeftClick = button === 0;
+  let isMiddleClick = button === 1;
+
+  if ((isLeftClick && (accel || shiftKey)) || isMiddleClick) {
+    let link = target.closest('a');
+
+    if (link && link.href)
+       getMostRecentBrowserWindow().openUILink(link.href, event)
+  }
+}
+
+function setupPanelFrame(frame) {
+  frame.setAttribute("flex", 1);
+  frame.setAttribute("transparent", "transparent");
+  frame.setAttribute("autocompleteenabled", true);
+  frame.setAttribute("tooltip", "aHTMLTooltip");
+  if (platform === "darwin") {
+    frame.style.borderRadius = "var(--arrowpanel-border-radius, 3.5px)";
+    frame.style.padding = "1px";
+  }
+}
+
+function make(document, options) {
+  document = document || getMostRecentBrowserWindow().document;
+  let panel = document.createElementNS(XUL_NS, "panel");
+  panel.setAttribute("type", "arrow");
+  panel.setAttribute("sdkscriptenabled", options.allowJavascript);
+
+  // The panel needs to be attached to a browser window in order for us
+  // to copy browser styles to the content document when it loads.
+  attach(panel, document);
+
+  let frameOptions =  {
+    allowJavascript: options.allowJavascript,
+    allowPlugins: true,
+    allowAuth: true,
+    allowWindowControl: false,
+    // Need to override `nodeName` to use `iframe` as `browsers` save session
+    // history and in consequence do not dispatch "inner-window-destroyed"
+    // notifications.
+    browser: false,
+  };
+
+  let backgroundFrame = createFrame(addonWindow, frameOptions);
+  setupPanelFrame(backgroundFrame);
+
+  getDocShell(backgroundFrame).inheritPrivateBrowsingId = false;
+
+  function onPopupShowing({type, target}) {
+    if (target === this) {
+      let attrs = getDocShell(backgroundFrame).getOriginAttributes();
+      getDocShell(panel.viewFrame).setOriginAttributes(attrs);
+
+      swapFrameLoaders(backgroundFrame, panel.viewFrame);
+    }
+  }
+
+  function onPopupHiding({type, target}) {
+    if (target === this) {
+      swapFrameLoaders(backgroundFrame, panel.viewFrame);
+
+      panel.viewFrame.remove();
+      panel.viewFrame = null;
+    }
+  }
+
+  function onContentReady({target, type}) {
+    if (target === getContentDocument(panel)) {
+      style(panel);
+      events.emit(type, { subject: panel });
+    }
+  }
+
+  function onContentLoad({target, type}) {
+    if (target === getContentDocument(panel))
+      events.emit(type, { subject: panel });
+  }
+
+  function onContentChange({subject: document, type}) {
+    if (document === getContentDocument(panel) && document.defaultView)
+      events.emit(type, { subject: panel });
+  }
+
+  function onPanelStateChange({target, type}) {
+    if (target === this)
+      events.emit(type, { subject: panel })
+  }
+
+  panel.addEventListener("popupshowing", onPopupShowing);
+  panel.addEventListener("popuphiding", onPopupHiding);
+  for (let event of ["popupshowing", "popuphiding", "popupshown", "popuphidden"])
+    panel.addEventListener(event, onPanelStateChange);
+
+  panel.addEventListener("click", onPanelClick, false);
+
+  // Panel content document can be either in panel `viewFrame` or in
+  // a `backgroundFrame` depending on panel state. Listeners are set
+  // on both to avoid setting and removing listeners on panel state changes.
+
+  panel.addEventListener("DOMContentLoaded", onContentReady, true);
+  backgroundFrame.addEventListener("DOMContentLoaded", onContentReady, true);
+
+  panel.addEventListener("load", onContentLoad, true);
+  backgroundFrame.addEventListener("load", onContentLoad, true);
+
+  events.on("document-element-inserted", onContentChange);
+
+  panel.backgroundFrame = backgroundFrame;
+  panel.viewFrame = null;
+
+  // Store event listener on the panel instance so that it won't be GC-ed
+  // while panel is alive.
+  panel.onContentChange = onContentChange;
+
+  return panel;
+}
+exports.make = make;
+
+function attach(panel, document) {
+  document = document || getMostRecentBrowserWindow().document;
+  let container = document.getElementById("mainPopupSet");
+  if (container !== panel.parentNode) {
+    detach(panel);
+    document.getElementById("mainPopupSet").appendChild(panel);
+  }
+}
+exports.attach = attach;
+
+function detach(panel) {
+  if (panel.parentNode) panel.parentNode.removeChild(panel);
+}
+exports.detach = detach;
+
+function dispose(panel) {
+  panel.backgroundFrame.remove();
+  panel.backgroundFrame = null;
+  events.off("document-element-inserted", panel.onContentChange);
+  panel.onContentChange = null;
+  detach(panel);
+}
+exports.dispose = dispose;
+
+function style(panel) {
+  /**
+  Injects default OS specific panel styles into content document that is loaded
+  into given panel. Optionally `document` of the browser window can be
+  given to inherit styles from it, by default it will use either panel owner
+  document or an active browser's document. It should not matter though unless
+  Firefox decides to style windows differently base on profile or mode like
+  chrome for example.
+  **/
+
+  try {
+    let document = panel.ownerDocument;
+    let contentDocument = getContentDocument(panel);
+    let window = document.defaultView;
+    let node = document.getAnonymousElementByAttribute(panel, "class",
+                                                       "panel-arrowcontent");
+
+    let { color, fontFamily, fontSize, fontWeight } = window.getComputedStyle(node);
+
+    let style = contentDocument.createElement("style");
+    style.id = "sdk-panel-style";
+    style.textContent = "body { " +
+      "color: " + color + ";" +
+      "font-family: " + fontFamily + ";" +
+      "font-weight: " + fontWeight + ";" +
+      "font-size: " + fontSize + ";" +
+    "}";
+
+    let container = contentDocument.head ? contentDocument.head :
+                    contentDocument.documentElement;
+
+    if (container.firstChild)
+      container.insertBefore(style, container.firstChild);
+    else
+      container.appendChild(style);
+  }
+  catch (error) {
+    console.error("Unable to apply panel style");
+    console.exception(error);
+  }
+}
+exports.style = style;
+
+var getContentFrame = panel => panel.viewFrame || panel.backgroundFrame;
+exports.getContentFrame = getContentFrame;
+
+function getContentDocument(panel) {
+  return getContentFrame(panel).contentDocument;
+}
+exports.getContentDocument = getContentDocument;
+
+function setURL(panel, url) {
+  let frame = getContentFrame(panel);
+  let webNav = getDocShell(frame).QueryInterface(Ci.nsIWebNavigation);
+
+  webNav.loadURI(url ? data.url(url) : "about:blank", 0, null, null, null);
+}
+
+exports.setURL = setURL;
+
+function allowContextMenu(panel, allow) {
+  if (allow) {
+    panel.setAttribute("context", "contentAreaContextMenu");
+  }
+  else {
+    panel.removeAttribute("context");
+  }
+}
+exports.allowContextMenu = allowContextMenu;