diff --git a/devtools/client/framework/toolbox.js b/devtools/client/framework/toolbox.js
index 4ec8647eb5..9b9fa66330 100644
--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -46,8 +46,6 @@ loader.lazyRequireGetter(this, "InspectorFront",
   "devtools/shared/fronts/inspector", true);
 loader.lazyRequireGetter(this, "flags",
   "devtools/shared/flags");
-loader.lazyRequireGetter(this, "showDoorhanger",
-  "devtools/client/shared/doorhanger", true);
 loader.lazyRequireGetter(this, "createPerformanceFront",
   "devtools/shared/fronts/performance", true);
 loader.lazyRequireGetter(this, "system",
diff --git a/devtools/client/responsivedesign/responsivedesign.jsm b/devtools/client/responsivedesign/responsivedesign.jsm
index 116ee3fb8e..0b41c97591 100644
--- a/devtools/client/responsivedesign/responsivedesign.jsm
+++ b/devtools/client/responsivedesign/responsivedesign.jsm
@@ -8,7 +8,6 @@ const Cu = Components.utils;
 
 var {loader, require} = Cu.import("resource://devtools/shared/Loader.jsm", {});
 var Telemetry = require("devtools/client/shared/telemetry");
-var {showDoorhanger} = require("devtools/client/shared/doorhanger");
 var {TouchEventSimulator} = require("devtools/shared/touch/simulator");
 var {Task} = require("devtools/shared/task");
 var promise = require("promise");
diff --git a/devtools/client/shared/doorhanger.js b/devtools/client/shared/doorhanger.js
deleted file mode 100644
index 4c6d6f8cb7..0000000000
--- a/devtools/client/shared/doorhanger.js
+++ /dev/null
@@ -1,137 +0,0 @@
-/* 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 { Ci, Cc } = require("chrome");
-const Services = require("Services");
-const { DOMHelpers } = require("resource://devtools/client/shared/DOMHelpers.jsm");
-const { Task } = require("devtools/shared/task");
-const defer = require("devtools/shared/defer");
-const { getMostRecentBrowserWindow } = require("sdk/window/utils");
-
-const XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-const LOCALE = Cc["@mozilla.org/chrome/chrome-registry;1"]
-               .getService(Ci.nsIXULChromeRegistry)
-               .getSelectedLocale("global");
-
-var TYPES = {
-  // We don't support any doorhanger types at the moment.
-  // This is vestigial from the FF dev edition promo.
-};
-
-var panelAttrs = {
-  orient: "vertical",
-  hidden: "false",
-  consumeoutsideclicks: "true",
-  noautofocus: "true",
-  align: "start",
-  role: "alert"
-};
-
-/**
- * Helper to call a doorhanger, defined in `TYPES`, with defined conditions,
- * success handlers and loads its own XUL in a frame. Takes an object with
- * several properties:
- *
- * @param {XULWindow} window
- *        The window that should house the doorhanger.
- * @param {String} type
- *        The type of doorhanger to be displayed is, using the `TYPES`
- *        definition.
- * @param {String} selector
- *        The selector that the doorhanger should be appended to within
- *        `window`.  Defaults to a XUL Document's `window` element.
- */
-exports.showDoorhanger = Task.async(function* ({ window, type, anchor }) {
-  let { predicate, success, url, action } = TYPES[type];
-  // Abort if predicate fails
-  if (!predicate()) {
-    return;
-  }
-
-  // Call success function to set preferences/cleanup immediately,
-  // so if triggered multiple times, only happens once (Windows/Linux)
-  success();
-
-  // Wait 200ms to prevent flickering where the popup is displayed
-  // before the underlying window (Windows 7, 64bit)
-  yield wait(200);
-
-  let document = window.document;
-
-  let panel = document.createElementNS(XULNS, "panel");
-  let frame = document.createElementNS(XULNS, "iframe");
-  let parentEl = document.querySelector("window");
-
-  frame.setAttribute("src", url);
-  let close = () => parentEl.removeChild(panel);
-
-  setDoorhangerStyle(panel, frame);
-
-  panel.appendChild(frame);
-  parentEl.appendChild(panel);
-
-  yield onFrameLoad(frame);
-
-  panel.openPopup(anchor);
-
-  let closeBtn = frame.contentDocument.querySelector("#close");
-  if (closeBtn) {
-    closeBtn.addEventListener("click", close);
-  }
-
-  let goBtn = frame.contentDocument.querySelector("#go");
-  if (goBtn) {
-    goBtn.addEventListener("click", () => {
-      if (action) {
-        action();
-      }
-      close();
-    });
-  }
-});
-
-function setDoorhangerStyle(panel, frame) {
-  Object.keys(panelAttrs).forEach(prop => {
-    return panel.setAttribute(prop, panelAttrs[prop]);
-  });
-  panel.style.margin = "20px";
-  panel.style.borderRadius = "5px";
-  panel.style.border = "none";
-  panel.style.MozAppearance = "none";
-  panel.style.backgroundColor = "transparent";
-
-  frame.style.borderRadius = "5px";
-  frame.setAttribute("flex", "1");
-  frame.setAttribute("width", "450");
-  frame.setAttribute("height", "179");
-}
-
-function onFrameLoad(frame) {
-  let { resolve, promise } = defer();
-
-  if (frame.contentWindow) {
-    let domHelper = new DOMHelpers(frame.contentWindow);
-    domHelper.onceDOMReady(resolve);
-  } else {
-    let callback = () => {
-      frame.removeEventListener("DOMContentLoaded", callback);
-      resolve();
-    };
-    frame.addEventListener("DOMContentLoaded", callback);
-  }
-
-  return promise;
-}
-
-function getGBrowser() {
-  return getMostRecentBrowserWindow().gBrowser;
-}
-
-function wait(n) {
-  let { resolve, promise } = defer();
-  setTimeout(resolve, n);
-  return promise;
-}
diff --git a/devtools/client/shared/moz.build b/devtools/client/shared/moz.build
index 21fcb29e05..814ab75cc4 100644
--- a/devtools/client/shared/moz.build
+++ b/devtools/client/shared/moz.build
@@ -26,7 +26,6 @@ DevToolsModules(
     'devices.js',
     'devtools-file-watcher.js',
     'DOMHelpers.jsm',
-    'doorhanger.js',
     'file-watcher-worker.js',
     'file-watcher.js',
     'getjson.js',
diff --git a/devtools/client/webconsole/hudservice.js b/devtools/client/webconsole/hudservice.js
index 9aa9e86aaf..284124137f 100644
--- a/devtools/client/webconsole/hudservice.js
+++ b/devtools/client/webconsole/hudservice.js
@@ -19,7 +19,6 @@ loader.lazyRequireGetter(this, "WebConsoleFrame", "devtools/client/webconsole/we
 loader.lazyRequireGetter(this, "gDevTools", "devtools/client/framework/devtools", true);
 loader.lazyRequireGetter(this, "DebuggerServer", "devtools/server/main", true);
 loader.lazyRequireGetter(this, "DebuggerClient", "devtools/shared/client/main", true);
-loader.lazyRequireGetter(this, "showDoorhanger", "devtools/client/shared/doorhanger", true);
 loader.lazyRequireGetter(this, "viewSource", "devtools/client/shared/view-source");
 
 const STRINGS_URI = "devtools/client/locales/webconsole.properties";