--- a/devtools/client/debugger/.eslintignore
+++ b/devtools/client/debugger/.eslintignore
@@ -2,13 +2,11 @@ assets/*
 src/test/examples/**
 src/test/integration/**
 src/test/unit-sources/**
 src/**/fixtures/**
 src/test/mochitest/**
 bin/
 packages/**/fixtures/**
 packages/devtools-config/**
-packages/devtools-contextmenu/**
 packages/devtools-environment/**
-packages/devtools-modules/**
 node_modules
 out

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-contextmenu/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-### DevTools ContextMenu
-
-
-The devtools contextmenu is an HTML shim, which lets us create
-fake contextmenus in HTML namespaces and real context menus in the
-firefox toolbox.

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-contextmenu/menu.css
+++ /dev/null
@@ -1,89 +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/. */
-
-menu {
-  display: inline;
-  padding: 0;
-}
-
-menu > menuitem::after {
-  content: "►";
-  float: right;
-  padding-left: 5px;
-}
-
-menu > menupopup {
-  display: none;
-}
-
-menu > menuitem:hover + menupopup,
-menu > menupopup:hover {
-  display: block;
-}
-
-menupopup {
-  position: fixed;
-  z-index: 10000;
-  background: white;
-  border: 1px solid #cccccc;
-  padding: 5px 0;
-  background: #f2f2f2;
-  border-radius: 5px;
-  color: #585858;
-  box-shadow: 0 0 4px 0 rgba(190, 190, 190, 0.8);
-  min-width: 130px;
-}
-
-menuitem {
-  display: block;
-  padding: 0 20px;
-  line-height: 20px;
-  font-weight: 500;
-  font-size: 13px;
-  user-select: none;
-}
-
-menuitem:hover {
-  background: #3780fb;
-  color: white;
-  cursor: pointer;
-}
-
-menuitem[disabled=true] {
-  color: #cccccc;
-}
-
-menuitem[disabled=true]:hover {
-  background-color: transparent;
-  cursor: default;
-}
-
-menuitem[type=checkbox]::before {
-  content: "";
-  width: 10px;
-  display: inline-block;
-}
-
-menuitem[type=checkbox][checked=true]::before {
-  content: "✓";
-  left: -8px;
-  position: relative;
-}
-
-menuseparator {
-  border-bottom: 1px solid #cacdd3;
-  width: 100%;
-  height: 5px;
-  display: block;
-  margin-bottom: 5px;
-}
-
-#contextmenu-mask.show {
-  position: fixed;
-  top: 0;
-  left: 0;
-  width: 100%;
-  height: 100%;
-  z-index: 999;
-}

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-contextmenu/menu.js
+++ /dev/null
@@ -1,148 +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/. */
-
-const Menu = require("devtools-modules/src/menu");
-const MenuItem = require("devtools-modules/src/menu/menu-item");
-
-function inToolbox() {
-  try {
-    return window.parent.document.documentURI.startsWith("about:devtools-toolbox");
-  } catch (e) {
-    // If `window` is not available, it's very likely that we are in the toolbox.
-    return true;
-  }
-}
-
-if (!inToolbox()) {
-  require("./menu.css");
-}
-
-function createPopup(doc) {
-  let popup = doc.createElement("menupopup");
-  popup.className = "landing-popup";
-  if (popup.openPopupAtScreen) {
-    return popup;
-  }
-
-  function preventDefault(e) {
-    e.preventDefault();
-    e.returnValue = false;
-  }
-
-  let mask = document.querySelector("#contextmenu-mask");
-  if (!mask) {
-    mask = doc.createElement("div");
-    mask.id = "contextmenu-mask";
-    document.body.appendChild(mask);
-  }
-
-  mask.onclick = () => popup.hidePopup();
-
-  popup.openPopupAtScreen = function (clientX, clientY) {
-    this.style.setProperty("left", `${clientX}px`);
-    this.style.setProperty("top", `${clientY}px`);
-    mask = document.querySelector("#contextmenu-mask");
-    window.onwheel = preventDefault;
-    mask.classList.add("show");
-    this.dispatchEvent(new Event("popupshown"));
-    this.popupshown;
-  };
-
-  popup.hidePopup = function () {
-    this.remove();
-    mask = document.querySelector("#contextmenu-mask");
-    mask.classList.remove("show");
-    window.onwheel = null;
-  };
-
-  return popup;
-}
-
-if (!inToolbox()) {
-  Menu.prototype.createPopup = createPopup;
-}
-
-function onShown(menu, popup) {
-  popup.childNodes.forEach((menuItemNode, i) => {
-    let item = menu.items[i];
-
-    if (!item.disabled && item.visible) {
-      menuItemNode.onclick = () => {
-        item.click();
-        popup.hidePopup();
-      };
-
-      showSubMenu(item.submenu, menuItemNode, popup);
-    }
-  });
-}
-
-function showMenu(evt, items) {
-  if (items.length === 0) {
-    return;
-  }
-
-  let menu = new Menu();
-  items
-    .filter((item) => item.visible === undefined || item.visible === true)
-    .forEach((item) => {
-      let menuItem = new MenuItem(item);
-      menuItem.submenu = createSubMenu(item.submenu);
-      menu.append(menuItem);
-    });
-
-  if (inToolbox()) {
-    menu.popup(evt.screenX, evt.screenY, window.parent.document);
-    return;
-  }
-
-  menu.on("open", (_, popup) => onShown(menu, popup));
-  menu.popup(evt.clientX, evt.clientY, document);
-}
-
-function createSubMenu(subItems) {
-  if (subItems) {
-    let subMenu = new Menu();
-    subItems.forEach((subItem) => {
-      subMenu.append(new MenuItem(subItem));
-    });
-    return subMenu;
-  }
-  return null;
-}
-
-function showSubMenu(subMenu, menuItemNode, popup) {
-  if (subMenu) {
-    let subMenuNode = menuItemNode.querySelector("menupopup");
-    let { top } = menuItemNode.getBoundingClientRect();
-    let { left, width } = popup.getBoundingClientRect();
-    subMenuNode.style.setProperty("left", `${left + width - 1}px`);
-    subMenuNode.style.setProperty("top", `${top}px`);
-
-    let subMenuItemNodes = menuItemNode
-      .querySelector("menupopup:not(.landing-popup)").childNodes;
-    subMenuItemNodes.forEach((subMenuItemNode, j) => {
-      let subMenuItem = subMenu.items.filter((item) =>
-        item.visible === undefined || item.visible === true)[j];
-      if (!subMenuItem.disabled && subMenuItem.visible) {
-        subMenuItemNode.onclick = () => {
-          subMenuItem.click();
-          popup.hidePopup();
-        };
-      }
-    });
-  }
-}
-
-function buildMenu(items) {
-  return items.map(itm => {
-    const hide = typeof itm.hidden === "function" ? itm.hidden() : itm.hidden;
-    return hide ? null : itm.item;
-  }).filter(itm => itm !== null);
-}
-
-module.exports = {
-  showMenu,
-  buildMenu
-};

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-contextmenu/package.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "name": "devtools-contextmenu",
-  "version": "1.0.14",
-  "description": "DevTools Contextmenu",
-  "main": "menu.js",
-  "scripts": {
-    "test": "# No tests available"
-  },
-  "author": "Jason Laster",
-  "license": "MPL-2.0",
-  "dependencies": {
-    "devtools-modules": "~1.1.9"
-  }
-}

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-contextmenu/yarn.lock
+++ /dev/null
@@ -1,18 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-devtools-modules@~1.1.5:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/devtools-modules/-/devtools-modules-1.1.5.tgz#55e71233692b4095f0277a00e6bfe3ff374d37f1"
-  dependencies:
-    devtools-services "0.0.1"
-    punycode "^2.1.0"
-
-devtools-services@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/devtools-services/-/devtools-services-0.0.1.tgz#9042600c11d1f4d45cc6ca299588a86fac1fbdd5"
-
-punycode@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.0.tgz#5f863edc89b96db09074bad7947bf09056ca4e7d"

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/LICENSE
+++ /dev/null
@@ -1,362 +0,0 @@
-Mozilla Public License, version 2.0
-
-1. Definitions
-
-1.1. "Contributor"
-
-     means each individual or legal entity that creates, contributes to the
-     creation of, or owns Covered Software.
-
-1.2. "Contributor Version"
-
-     means the combination of the Contributions of others (if any) used by a
-     Contributor and that particular Contributor's Contribution.
-
-1.3. "Contribution"
-
-     means Covered Software of a particular Contributor.
-
-1.4. "Covered Software"
-
-     means Source Code Form to which the initial Contributor has attached the
-     notice in Exhibit A, the Executable Form of such Source Code Form, and
-     Modifications of such Source Code Form, in each case including portions
-     thereof.
-
-1.5. "Incompatible With Secondary Licenses"
-     means
-
-     a. that the initial Contributor has attached the notice described in
-        Exhibit B to the Covered Software; or
-
-     b. that the Covered Software was made available under the terms of
-        version 1.1 or earlier of the License, but not also under the terms of
-        a Secondary License.
-
-1.6. "Executable Form"
-
-     means any form of the work other than Source Code Form.
-
-1.7. "Larger Work"
-
-     means a work that combines Covered Software with other material, in a
-     separate file or files, that is not Covered Software.
-
-1.8. "License"
-
-     means this document.
-
-1.9. "Licensable"
-
-     means having the right to grant, to the maximum extent possible, whether
-     at the time of the initial grant or subsequently, any and all of the
-     rights conveyed by this License.
-
-1.10. "Modifications"
-
-     means any of the following:
-
-     a. any file in Source Code Form that results from an addition to,
-        deletion from, or modification of the contents of Covered Software; or
-
-     b. any new file in Source Code Form that contains any Covered Software.
-
-1.11. "Patent Claims" of a Contributor
-
-      means any patent claim(s), including without limitation, method,
-      process, and apparatus claims, in any patent Licensable by such
-      Contributor that would be infringed, but for the grant of the License,
-      by the making, using, selling, offering for sale, having made, import,
-      or transfer of either its Contributions or its Contributor Version.
-
-1.12. "Secondary License"
-
-      means either the GNU General Public License, Version 2.0, the GNU Lesser
-      General Public License, Version 2.1, the GNU Affero General Public
-      License, Version 3.0, or any later versions of those licenses.
-
-1.13. "Source Code Form"
-
-      means the form of the work preferred for making modifications.
-
-1.14. "You" (or "Your")
-
-      means an individual or a legal entity exercising rights under this
-      License. For legal entities, "You" includes any entity that controls, is
-      controlled by, or is under common control with You. For purposes of this
-      definition, "control" means (a) the power, direct or indirect, to cause
-      the direction or management of such entity, whether by contract or
-      otherwise, or (b) ownership of more than fifty percent (50%) of the
-      outstanding shares or beneficial ownership of such entity.
-
-
-2. License Grants and Conditions
-
-2.1. Grants
-
-     Each Contributor hereby grants You a world-wide, royalty-free,
-     non-exclusive license:
-
-     a. under intellectual property rights (other than patent or trademark)
-        Licensable by such Contributor to use, reproduce, make available,
-        modify, display, perform, distribute, and otherwise exploit its
-        Contributions, either on an unmodified basis, with Modifications, or
-        as part of a Larger Work; and
-
-     b. under Patent Claims of such Contributor to make, use, sell, offer for
-        sale, have made, import, and otherwise transfer either its
-        Contributions or its Contributor Version.
-
-2.2. Effective Date
-
-     The licenses granted in Section 2.1 with respect to any Contribution
-     become effective for each Contribution on the date the Contributor first
-     distributes such Contribution.
-
-2.3. Limitations on Grant Scope
-
-     The licenses granted in this Section 2 are the only rights granted under
-     this License. No additional rights or licenses will be implied from the
-     distribution or licensing of Covered Software under this License.
-     Notwithstanding Section 2.1(b) above, no patent license is granted by a
-     Contributor:
-
-     a. for any code that a Contributor has removed from Covered Software; or
-
-     b. for infringements caused by: (i) Your and any other third party's
-        modifications of Covered Software, or (ii) the combination of its
-        Contributions with other software (except as part of its Contributor
-        Version); or
-
-     c. under Patent Claims infringed by Covered Software in the absence of
-        its Contributions.
-
-     This License does not grant any rights in the trademarks, service marks,
-     or logos of any Contributor (except as may be necessary to comply with
-     the notice requirements in Section 3.4).
-
-2.4. Subsequent Licenses
-
-     No Contributor makes additional grants as a result of Your choice to
-     distribute the Covered Software under a subsequent version of this
-     License (see Section 10.2) or under the terms of a Secondary License (if
-     permitted under the terms of Section 3.3).
-
-2.5. Representation
-
-     Each Contributor represents that the Contributor believes its
-     Contributions are its original creation(s) or it has sufficient rights to
-     grant the rights to its Contributions conveyed by this License.
-
-2.6. Fair Use
-
-     This License is not intended to limit any rights You have under
-     applicable copyright doctrines of fair use, fair dealing, or other
-     equivalents.
-
-2.7. Conditions
-
-     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
-     Section 2.1.
-
-
-3. Responsibilities
-
-3.1. Distribution of Source Form
-
-     All distribution of Covered Software in Source Code Form, including any
-     Modifications that You create or to which You contribute, must be under
-     the terms of this License. You must inform recipients that the Source
-     Code Form of the Covered Software is governed by the terms of this
-     License, and how they can obtain a copy of this License. You may not
-     attempt to alter or restrict the recipients' rights in the Source Code
-     Form.
-
-3.2. Distribution of Executable Form
-
-     If You distribute Covered Software in Executable Form then:
-
-     a. such Covered Software must also be made available in Source Code Form,
-        as described in Section 3.1, and You must inform recipients of the
-        Executable Form how they can obtain a copy of such Source Code Form by
-        reasonable means in a timely manner, at a charge no more than the cost
-        of distribution to the recipient; and
-
-     b. You may distribute such Executable Form under the terms of this
-        License, or sublicense it under different terms, provided that the
-        license for the Executable Form does not attempt to limit or alter the
-        recipients' rights in the Source Code Form under this License.
-
-3.3. Distribution of a Larger Work
-
-     You may create and distribute a Larger Work under terms of Your choice,
-     provided that You also comply with the requirements of this License for
-     the Covered Software. If the Larger Work is a combination of Covered
-     Software with a work governed by one or more Secondary Licenses, and the
-     Covered Software is not Incompatible With Secondary Licenses, this
-     License permits You to additionally distribute such Covered Software
-     under the terms of such Secondary License(s), so that the recipient of
-     the Larger Work may, at their option, further distribute the Covered
-     Software under the terms of either this License or such Secondary
-     License(s).
-
-3.4. Notices
-
-     You may not remove or alter the substance of any license notices
-     (including copyright notices, patent notices, disclaimers of warranty, or
-     limitations of liability) contained within the Source Code Form of the
-     Covered Software, except that You may alter any license notices to the
-     extent required to remedy known factual inaccuracies.
-
-3.5. Application of Additional Terms
-
-     You may choose to offer, and to charge a fee for, warranty, support,
-     indemnity or liability obligations to one or more recipients of Covered
-     Software. However, You may do so only on Your own behalf, and not on
-     behalf of any Contributor. You must make it absolutely clear that any
-     such warranty, support, indemnity, or liability obligation is offered by
-     You alone, and You hereby agree to indemnify every Contributor for any
-     liability incurred by such Contributor as a result of warranty, support,
-     indemnity or liability terms You offer. You may include additional
-     disclaimers of warranty and limitations of liability specific to any
-     jurisdiction.
-
-4. Inability to Comply Due to Statute or Regulation
-
-   If it is impossible for You to comply with any of the terms of this License
-   with respect to some or all of the Covered Software due to statute,
-   judicial order, or regulation then You must: (a) comply with the terms of
-   this License to the maximum extent possible; and (b) describe the
-   limitations and the code they affect. Such description must be placed in a
-   text file included with all distributions of the Covered Software under
-   this License. Except to the extent prohibited by statute or regulation,
-   such description must be sufficiently detailed for a recipient of ordinary
-   skill to be able to understand it.
-
-5. Termination
-
-5.1. The rights granted under this License will terminate automatically if You
-     fail to comply with any of its terms. However, if You become compliant,
-     then the rights granted under this License from a particular Contributor
-     are reinstated (a) provisionally, unless and until such Contributor
-     explicitly and finally terminates Your grants, and (b) on an ongoing
-     basis, if such Contributor fails to notify You of the non-compliance by
-     some reasonable means prior to 60 days after You have come back into
-     compliance. Moreover, Your grants from a particular Contributor are
-     reinstated on an ongoing basis if such Contributor notifies You of the
-     non-compliance by some reasonable means, this is the first time You have
-     received notice of non-compliance with this License from such
-     Contributor, and You become compliant prior to 30 days after Your receipt
-     of the notice.
-
-5.2. If You initiate litigation against any entity by asserting a patent
-     infringement claim (excluding declaratory judgment actions,
-     counter-claims, and cross-claims) alleging that a Contributor Version
-     directly or indirectly infringes any patent, then the rights granted to
-     You by any and all Contributors for the Covered Software under Section
-     2.1 of this License shall terminate.
-
-5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
-     license agreements (excluding distributors and resellers) which have been
-     validly granted by You or Your distributors under this License prior to
-     termination shall survive termination.
-
-6. Disclaimer of Warranty
-
-   Covered Software is provided under this License on an "as is" basis,
-   without warranty of any kind, either expressed, implied, or statutory,
-   including, without limitation, warranties that the Covered Software is free
-   of defects, merchantable, fit for a particular purpose or non-infringing.
-   The entire risk as to the quality and performance of the Covered Software
-   is with You. Should any Covered Software prove defective in any respect,
-   You (not any Contributor) assume the cost of any necessary servicing,
-   repair, or correction. This disclaimer of warranty constitutes an essential
-   part of this License. No use of  any Covered Software is authorized under
-   this License except under this disclaimer.
-
-7. Limitation of Liability
-
-   Under no circumstances and under no legal theory, whether tort (including
-   negligence), contract, or otherwise, shall any Contributor, or anyone who
-   distributes Covered Software as permitted above, be liable to You for any
-   direct, indirect, special, incidental, or consequential damages of any
-   character including, without limitation, damages for lost profits, loss of
-   goodwill, work stoppage, computer failure or malfunction, or any and all
-   other commercial damages or losses, even if such party shall have been
-   informed of the possibility of such damages. This limitation of liability
-   shall not apply to liability for death or personal injury resulting from
-   such party's negligence to the extent applicable law prohibits such
-   limitation. Some jurisdictions do not allow the exclusion or limitation of
-   incidental or consequential damages, so this exclusion and limitation may
-   not apply to You.
-
-8. Litigation
-
-   Any litigation relating to this License may be brought only in the courts
-   of a jurisdiction where the defendant maintains its principal place of
-   business and such litigation shall be governed by laws of that
-   jurisdiction, without reference to its conflict-of-law provisions. Nothing
-   in this Section shall prevent a party's ability to bring cross-claims or
-   counter-claims.
-
-9. Miscellaneous
-
-   This License represents the complete agreement concerning the subject
-   matter hereof. If any provision of this License is held to be
-   unenforceable, such provision shall be reformed only to the extent
-   necessary to make it enforceable. Any law or regulation which provides that
-   the language of a contract shall be construed against the drafter shall not
-   be used to construe this License against a Contributor.
-
-
-10. Versions of the License
-
-10.1. New Versions
-
-      Mozilla Foundation is the license steward. Except as provided in Section
-      10.3, no one other than the license steward has the right to modify or
-      publish new versions of this License. Each version will be given a
-      distinguishing version number.
-
-10.2. Effect of New Versions
-
-      You may distribute the Covered Software under the terms of the version
-      of the License under which You originally received the Covered Software,
-      or under the terms of any subsequent version published by the license
-      steward.
-
-10.3. Modified Versions
-
-      If you create software not governed by this License, and you want to
-      create a new license for such software, you may create and use a
-      modified version of this License if you rename the license and remove
-      any references to the name of the license steward (except to note that
-      such modified license differs from this License).
-
-10.4. Distributing Source Code Form that is Incompatible With Secondary
-      Licenses If You choose to distribute Source Code Form that is
-      Incompatible With Secondary Licenses under the terms of this version of
-      the License, the notice described in Exhibit B of this License must be
-      attached.
-
-Exhibit A - Source Code Form License Notice
-
-      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/.
-
-If it is not possible or desirable to put the notice in a particular file,
-then You may include the notice in a location (such as a LICENSE file in a
-relevant directory) where a recipient would be likely to look for such a
-notice.
-
-You may add additional accurate notices of copyright ownership.
-
-Exhibit B - "Incompatible With Secondary Licenses" Notice
-
-      This Source Code Form is "Incompatible
-      With Secondary Licenses", as defined by
-      the Mozilla Public License, v. 2.0.

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/README.md
+++ /dev/null
@@ -1,8 +0,0 @@
-## Devtools Modules
-
-[![Npm version](https://img.shields.io/npm/v/devtools-modules.svg)](https://npmjs.org/package/devtools-modules)
-
-* *KeyShortcuts* - keyboard shortcuts library
-* *Menu* - Context Menu library
-* *Services* - A de-privilidged shim for prefs and appInfo
-* *PrefsHelper* - A Prefs convenience Wrapper

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/index.js
+++ /dev/null
@@ -1,24 +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/. */
-
-const { PrefsHelper } = require("./src/prefs");
-const KeyShortcuts = require("./src/key-shortcuts");
-const EventEmitter = require("./src/utils/event-emitter");
-const Telemetry = require("./src/utils/telemetry");
-const { getUnicodeHostname, getUnicodeUrlPath, getUnicodeUrl } =
-  require("./src/unicode-url");
-const PluralForm = require("./src/plural-form");
-const saveAs = require("./src/saveAs")
-
-module.exports = {
-  KeyShortcuts,
-  PrefsHelper,
-  EventEmitter,
-  Telemetry,
-  getUnicodeHostname,
-  getUnicodeUrlPath,
-  getUnicodeUrl,
-  PluralForm,
-  saveAs
-};

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/package.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  "name": "devtools-modules",
-  "version": "1.1.9",
-  "description": "DevTools Modules from M-C",
-  "main": "index.js",
-  "scripts": {
-    "license-check": "devtools-license-check",
-    "test": "jest"
-  },
-  "author": "",
-  "license": "MPL-2.0",
-  "dependencies": {
-    "punycode": "^2.1.0",
-    "devtools-services": "0.0.1"
-  },
-  "devDependencies": {
-    "jest": "^23.0.0"
-  },
-  "files": [
-    "src"
-  ],
-  "jest": {
-    "rootDir": "src",
-    "testMatch": [
-      "**/tests/**/*.js"
-    ],
-    "testPathIgnorePatterns": [
-      "<rootDir>/tests/helpers/local-storage-mock.js"
-    ],
-    "transformIgnorePatterns": [],
-    "setupFiles": [
-      "<rootDir>/tests/helpers/local-storage-mock.js"
-    ],
-    "moduleNameMapper": {},
-    "testURL": "http://localhost/"
-  }
-}

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/key-shortcuts.js
+++ /dev/null
@@ -1,243 +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/. */
-
-const { appinfo } = require("devtools-services");
-const EventEmitter = require("./utils/event-emitter");
-const isOSX = appinfo.OS === "Darwin";
-
-// List of electron keys mapped to DOM API (DOM_VK_*) key code
-const ElectronKeysMapping = {
-  "F1": "DOM_VK_F1",
-  "F2": "DOM_VK_F2",
-  "F3": "DOM_VK_F3",
-  "F4": "DOM_VK_F4",
-  "F5": "DOM_VK_F5",
-  "F6": "DOM_VK_F6",
-  "F7": "DOM_VK_F7",
-  "F8": "DOM_VK_F8",
-  "F9": "DOM_VK_F9",
-  "F10": "DOM_VK_F10",
-  "F11": "DOM_VK_F11",
-  "F12": "DOM_VK_F12",
-  "F13": "DOM_VK_F13",
-  "F14": "DOM_VK_F14",
-  "F15": "DOM_VK_F15",
-  "F16": "DOM_VK_F16",
-  "F17": "DOM_VK_F17",
-  "F18": "DOM_VK_F18",
-  "F19": "DOM_VK_F19",
-  "F20": "DOM_VK_F20",
-  "F21": "DOM_VK_F21",
-  "F22": "DOM_VK_F22",
-  "F23": "DOM_VK_F23",
-  "F24": "DOM_VK_F24",
-  "Space": "DOM_VK_SPACE",
-  "Backspace": "DOM_VK_BACK_SPACE",
-  "Delete": "DOM_VK_DELETE",
-  "Insert": "DOM_VK_INSERT",
-  "Return": "DOM_VK_RETURN",
-  "Enter": "DOM_VK_RETURN",
-  "Up": "DOM_VK_UP",
-  "Down": "DOM_VK_DOWN",
-  "Left": "DOM_VK_LEFT",
-  "Right": "DOM_VK_RIGHT",
-  "Home": "DOM_VK_HOME",
-  "End": "DOM_VK_END",
-  "PageUp": "DOM_VK_PAGE_UP",
-  "PageDown": "DOM_VK_PAGE_DOWN",
-  "Escape": "DOM_VK_ESCAPE",
-  "Esc": "DOM_VK_ESCAPE",
-  "Tab": "DOM_VK_TAB",
-  "VolumeUp": "DOM_VK_VOLUME_UP",
-  "VolumeDown": "DOM_VK_VOLUME_DOWN",
-  "VolumeMute": "DOM_VK_VOLUME_MUTE",
-  "PrintScreen": "DOM_VK_PRINTSCREEN",
-};
-
-/**
- * Helper to listen for keyboard events decribed in .properties file.
- *
- * let shortcuts = new KeyShortcuts({
- *   window
- * });
- * shortcuts.on("Ctrl+F", event => {
- *   // `event` is the KeyboardEvent which relates to the key shortcuts
- * });
- *
- * @param DOMWindow window
- *        The window object of the document to listen events from.
- * @param DOMElement target
- *        Optional DOM Element on which we should listen events from.
- *        If omitted, we listen for all events fired on `window`.
- */
-function KeyShortcuts({ window, target }) {
-  this.window = window;
-  this.target = target || window;
-  this.keys = new Map();
-  this.eventEmitter = new EventEmitter();
-  this.target.addEventListener("keydown", this);
-}
-
-/*
- * Parse an electron-like key string and return a normalized object which
- * allow efficient match on DOM key event. The normalized object matches DOM
- * API.
- *
- * @param DOMWindow window
- *        Any DOM Window object, just to fetch its `KeyboardEvent` object
- * @param String str
- *        The shortcut string to parse, following this document:
- *        https://github.com/electron/electron/blob/master/docs/api/accelerator.md
- */
-KeyShortcuts.parseElectronKey = function(window, str) {
-  let modifiers = str.split("+");
-  let key = modifiers.pop();
-
-  let shortcut = {
-    ctrl: false,
-    meta: false,
-    alt: false,
-    shift: false,
-    // Set for character keys
-    key: undefined,
-    // Set for non-character keys
-    keyCode: undefined,
-  };
-  for (let mod of modifiers) {
-    if (mod === "Alt") {
-      shortcut.alt = true;
-    } else if (["Command", "Cmd"].includes(mod)) {
-      shortcut.meta = true;
-    } else if (["CommandOrControl", "CmdOrCtrl"].includes(mod)) {
-      if (isOSX) {
-        shortcut.meta = true;
-      } else {
-        shortcut.ctrl = true;
-      }
-    } else if (["Control", "Ctrl"].includes(mod)) {
-      shortcut.ctrl = true;
-    } else if (mod === "Shift") {
-      shortcut.shift = true;
-    } else {
-      console.error("Unsupported modifier:", mod, "from key:", str);
-      return null;
-    }
-  }
-
-  // Plus is a special case. It's a character key and shouldn't be matched
-  // against a keycode as it is only accessible via Shift/Capslock
-  if (key === "Plus") {
-    key = "+";
-  }
-
-  if (typeof key === "string" && key.length === 1) {
-    // Match any single character
-    shortcut.key = key.toLowerCase();
-  } else if (key in ElectronKeysMapping) {
-    // Maps the others manually to DOM API DOM_VK_*
-    key = ElectronKeysMapping[key];
-    shortcut.keyCode = window.KeyboardEvent[key];
-    // Used only to stringify the shortcut
-    shortcut.keyCodeString = key;
-    shortcut.key = key;
-  } else {
-    console.error("Unsupported key:", key);
-    return null;
-  }
-
-  return shortcut;
-};
-
-KeyShortcuts.stringify = function(shortcut) {
-  let list = [];
-  if (shortcut.alt) {
-    list.push("Alt");
-  }
-  if (shortcut.ctrl) {
-    list.push("Ctrl");
-  }
-  if (shortcut.meta) {
-    list.push("Cmd");
-  }
-  if (shortcut.shift) {
-    list.push("Shift");
-  }
-  let key;
-  if (shortcut.key) {
-    key = shortcut.key.toUpperCase();
-  } else {
-    key = shortcut.keyCodeString;
-  }
-  list.push(key);
-  return list.join("+");
-};
-
-KeyShortcuts.prototype = {
-  destroy() {
-    this.target.removeEventListener("keydown", this);
-    this.keys.clear();
-  },
-
-  doesEventMatchShortcut(event, shortcut) {
-    if (shortcut.meta != event.metaKey) {
-      return false;
-    }
-    if (shortcut.ctrl != event.ctrlKey) {
-      return false;
-    }
-    if (shortcut.alt != event.altKey) {
-      return false;
-    }
-    // Shift is a special modifier, it may implicitely be required if the
-    // expected key is a special character accessible via shift.
-    if (shortcut.shift != event.shiftKey && event.key &&
-        event.key.match(/[a-zA-Z]/)) {
-      return false;
-    }
-    if (shortcut.keyCode) {
-      return event.keyCode == shortcut.keyCode;
-    } else if (event.key in ElectronKeysMapping) {
-      return ElectronKeysMapping[event.key] === shortcut.key;
-    }
-
-    // get the key from the keyCode if key is not provided.
-    let key = event.key || String.fromCharCode(event.keyCode);
-
-    // For character keys, we match if the final character is the expected one.
-    // But for digits we also accept indirect match to please azerty keyboard,
-    // which requires Shift to be pressed to get digits.
-    return key.toLowerCase() == shortcut.key ||
-      (shortcut.key.match(/^[0-9]$/) &&
-       event.keyCode == shortcut.key.charCodeAt(0));
-  },
-
-  handleEvent(event) {
-    for (let [key, shortcut] of this.keys) {
-      if (this.doesEventMatchShortcut(event, shortcut)) {
-        this.eventEmitter.emit(key, event);
-      }
-    }
-  },
-
-  on(key, listener) {
-    if (typeof listener !== "function") {
-      throw new Error("KeyShortcuts.on() expects a function as " +
-                      "second argument");
-    }
-    if (!this.keys.has(key)) {
-      let shortcut = KeyShortcuts.parseElectronKey(this.window, key);
-      // The key string is wrong and we were unable to compute the key shortcut
-      if (!shortcut) {
-        return;
-      }
-      this.keys.set(key, shortcut);
-    }
-    this.eventEmitter.on(key, listener);
-  },
-
-  off(key, listener) {
-    this.eventEmitter.off(key, listener);
-  },
-};
-module.exports = KeyShortcuts;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/menu/index.js
+++ /dev/null
@@ -1,247 +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/. */
-
-import Services from "devtools-services";
-
-const { appinfo } = Services;
-
-const isMacOS = appinfo.OS === "Darwin";
-
-const EventEmitter = require("../utils/event-emitter");
-
-/**
- * Formats key for use in tooltips
- * For macOS we use the following unicode
- *
- * cmd ⌘ = \u2318
- * shift ⇧ – \u21E7
- * option (alt) ⌥ \u2325
- *
- * For Win/Lin this replaces CommandOrControl or CmdOrCtrl with Ctrl
- *
- * @static
- */
-function formatKeyShortcut(shortcut) {
-    if (isMacOS) {
-        return shortcut
-            .replace(/Shift\+/g, "\u21E7")
-            .replace(/Command\+|Cmd\+/g, "\u2318")
-            .replace(/CommandOrControl\+|CmdOrCtrl\+/g, "\u2318")
-            .replace(/Alt\+/g, "\u2325");
-    }
-    return shortcut
-        .replace(/CommandOrControl\+|CmdOrCtrl\+/g, `${L10N.getStr("ctrl")}+`)
-        .replace(/Shift\+/g, "Shift+");
-}
-
-function inToolbox() {
-  try {
-    return window.parent.document.documentURI.startsWith("about:devtools-toolbox");
-  } catch (e) {
-    // If `window` is not available, it's very likely that we are in the toolbox.
-    return true;
-  }
-}
-
-// Copied from m-c DevToolsUtils.
-function getTopWindow(win) {
-  return win.windowRoot ? win.windowRoot.ownerGlobal : win.top;
-}
-
-/**
- * A partial implementation of the Menu API provided by electron:
- * https://github.com/electron/electron/blob/master/docs/api/menu.md.
- *
- * Extra features:
- *  - Emits an 'open' and 'close' event when the menu is opened/closed
-
- * @param String id (non standard)
- *        Needed so tests can confirm the XUL implementation is working
- */
-function Menu({ id = null } = {}) {
-  this.menuitems = [];
-  this.id = id;
-
-  Object.defineProperty(this, "items", {
-    get() {
-      return this.menuitems;
-    }
-  });
-
-  EventEmitter.decorate(this);
-}
-
-/**
- * Add an item to the end of the Menu
- *
- * @param {MenuItem} menuItem
- */
-Menu.prototype.append = function (menuItem) {
-  this.menuitems.push(menuItem);
-};
-
-/**
- * Add an item to a specified position in the menu
- *
- * @param {int} pos
- * @param {MenuItem} menuItem
- */
-Menu.prototype.insert = function (pos, menuItem) {
-  throw Error("Not implemented");
-};
-
-/**
- * Show the Menu at a specified location on the screen
- *
- * Missing features:
- *   - browserWindow - BrowserWindow (optional) - Default is null.
- *   - positioningItem Number - (optional) OS X
- *
- * @param {int} screenX
- * @param {int} screenY
- * @param {Document} doc
- *        The document that should own the context menu.
- */
-Menu.prototype.popup = function (screenX, screenY, doc) {
-  // The context-menu will be created in the topmost window to preserve keyboard
-  // navigation. See Bug 1543940. Keep a reference on the window owning the menu to hide
-  // the popup on unload.
-  const win = doc.defaultView;
-  doc = getTopWindow(doc.defaultView).document;
-
-  let popupset = doc.querySelector("popupset");
-  if (!popupset) {
-    popupset = doc.createXULElement("popupset");
-    doc.documentElement.appendChild(popupset);
-  }
-  // See bug 1285229, on Windows, opening the same popup multiple times in a
-  // row ends up duplicating the popup. The newly inserted popup doesn't
-  // dismiss the old one. So remove any previously displayed popup before
-  // opening a new one.
-  let popup = popupset.querySelector("menupopup[menu-api=\"true\"]");
-  if (popup) {
-    popup.hidePopup();
-  }
-
-  popup = this.createPopup(doc);
-  popup.setAttribute("menu-api", "true");
-
-  if (this.id) {
-    popup.id = this.id;
-  }
-  this._createMenuItems(popup);
-
-  // The context menu will be created in the topmost chrome window. Hide it manually when
-  // the owner document is unloaded.
-  const onWindowUnload = () => popup.hidePopup();
-  win.addEventListener("unload", onWindowUnload);
-
-  // Remove the menu from the DOM once it's hidden.
-  popup.addEventListener("popuphidden", (e) => {
-    if (e.target === popup) {
-      win.removeEventListener("unload", onWindowUnload);
-      popup.remove();
-      this.emit("close", popup);
-    }
-  });
-
-  popup.addEventListener("popupshown", (e) => {
-    if (e.target === popup) {
-      this.emit("open", popup);
-    }
-  });
-
-  popupset.appendChild(popup);
-  popup.openPopupAtScreen(screenX, screenY, true);
-};
-
-Menu.prototype.createPopup = function(doc) {
-  return doc.createElement("menupopup");
-}
-
-Menu.prototype._createMenuItems = function(parent) {
-  let doc = parent.ownerDocument;
-  this.menuitems.forEach(item => {
-    if (!item.visible) {
-      return;
-    }
-
-    if (item.submenu) {
-      let menupopup = doc.createElement("menupopup");
-      item.submenu._createMenuItems(menupopup);
-
-      let menuitem = doc.createElement("menuitem");
-      menuitem.setAttribute("label", item.label);
-      if (!inToolbox()) {
-        menuitem.textContent = item.label;
-      }
-
-      let menu = doc.createElement("menu");
-      menu.appendChild(menuitem);
-      menu.appendChild(menupopup);
-      if (item.disabled) {
-        menu.setAttribute("disabled", "true");
-      }
-      if (item.accesskey) {
-        menu.setAttribute("accesskey", item.accesskey);
-      }
-      if (item.id) {
-        menu.id = item.id;
-      }
-      if (item.accelerator) {
-        menuitem.setAttribute("acceltext", formatKeyShortcut(item.accelerator));
-      }
-      parent.appendChild(menu);
-    } else if (item.type === "separator") {
-      let menusep = doc.createElement("menuseparator");
-      parent.appendChild(menusep);
-    } else {
-      let menuitem = doc.createElement("menuitem");
-      menuitem.setAttribute("label", item.label);
-
-      if (!inToolbox()) {
-        menuitem.textContent = item.label;
-      }
-
-      menuitem.addEventListener("command", () => item.click());
-
-      if (item.type === "checkbox") {
-        menuitem.setAttribute("type", "checkbox");
-      }
-      if (item.type === "radio") {
-        menuitem.setAttribute("type", "radio");
-      }
-      if (item.disabled) {
-        menuitem.setAttribute("disabled", "true");
-      }
-      if (item.checked) {
-        menuitem.setAttribute("checked", "true");
-      }
-      if (item.accesskey) {
-        menuitem.setAttribute("accesskey", item.accesskey);
-      }
-      if (item.id) {
-        menuitem.id = item.id;
-      }
-      if (item.accelerator) {
-        menuitem.setAttribute("acceltext", formatKeyShortcut(item.accelerator));
-      }
-      parent.appendChild(menuitem);
-    }
-  });
-};
-
-Menu.setApplicationMenu = () => {
-  throw Error("Not implemented");
-};
-
-Menu.sendActionToFirstResponder = () => {
-  throw Error("Not implemented");
-};
-
-Menu.buildFromTemplate = () => {
-  throw Error("Not implemented");
-};
-
-module.exports = Menu;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/menu/menu-item.js
+++ /dev/null
@@ -1,64 +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/. */
-
-/**
- * A partial implementation of the MenuItem API provided by electron:
- * https://github.com/electron/electron/blob/master/docs/api/menu-item.md.
- *
- * Missing features:
- *   - id String - Unique within a single menu. If defined then it can be used
- *                 as a reference to this item by the position attribute.
- *   - role String - Define the action of the menu item; when specified the
- *                   click property will be ignored
- *   - sublabel String
- *   - icon NativeImage
- *   - position String - This field allows fine-grained definition of the
- *                       specific location within a given menu.
- *
- * Implemented features:
- *  @param Object options
- *    Function click
- *      Will be called with click(menuItem, browserWindow) when the menu item
- *       is clicked
- *    String type
- *      Can be normal, separator, submenu, checkbox or radio
- *    String label
- *    Boolean enabled
- *      If false, the menu item will be greyed out and unclickable.
- *    Boolean checked
- *      Should only be specified for checkbox or radio type menu items.
- *    Menu submenu
- *      Should be specified for submenu type menu items. If submenu is specified,
- *      the type: 'submenu' can be omitted. If the value is not a Menu then it
- *      will be automatically converted to one using Menu.buildFromTemplate.
- *    Boolean visible
- *      If false, the menu item will be entirely hidden.
- *    String accelerator
- *      If specified, will be used as accelerator text for MenuItem
- */
-function MenuItem({
-    accesskey = null,
-    checked = false,
-    click = () => {},
-    disabled = false,
-    label = "",
-    id = null,
-    submenu = null,
-    type = "normal",
-    visible = true,
-    accelerator = "",
-} = { }) {
-  this.accesskey = accesskey;
-  this.checked = checked;
-  this.click = click;
-  this.disabled = disabled;
-  this.id = id;
-  this.label = label;
-  this.submenu = submenu;
-  this.type = type;
-  this.visible = visible;
-  this.accelerator = accelerator;
-}
-
-module.exports = MenuItem;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/plural-form.js
+++ /dev/null
@@ -1,160 +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/. */
-
-// These are the available plural functions that give the appropriate index
-// based on the plural rule number specified. The first element is the number
-// of plural forms and the second is the function to figure out the index.
-const gFunctions = [
-  // 0: Chinese
-  [1, (n) => 0],
-  // 1: English
-  [2, (n) => n!=1?1:0],
-  // 2: French
-  [2, (n) => n>1?1:0],
-  // 3: Latvian
-  [3, (n) => n%10==1&&n%100!=11?1:n%10==0?0:2],
-  // 4: Scottish Gaelic
-  [4, (n) => n==1||n==11?0:n==2||n==12?1:n>0&&n<20?2:3],
-  // 5: Romanian
-  [3, (n) => n==1?0:n==0||n%100>0&&n%100<20?1:2],
-  // 6: Lithuanian
-  [3, (n) => n%10==1&&n%100!=11?0:n%10>=2&&(n%100<10||n%100>=20)?2:1],
-  // 7: Russian
-  [3, (n) => n%10==1&&n%100!=11?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
-  // 8: Slovak
-  [3, (n) => n==1?0:n>=2&&n<=4?1:2],
-  // 9: Polish
-  [3, (n) => n==1?0:n%10>=2&&n%10<=4&&(n%100<10||n%100>=20)?1:2],
-  // 10: Slovenian
-  [4, (n) => n%100==1?0:n%100==2?1:n%100==3||n%100==4?2:3],
-  // 11: Irish Gaeilge
-  [5, (n) => n==1?0:n==2?1:n>=3&&n<=6?2:n>=7&&n<=10?3:4],
-  // 12: Arabic
-  [6, (n) => n==0?5:n==1?0:n==2?1:n%100>=3&&n%100<=10?2:n%100>=11&&n%100<=99?3:4],
-  // 13: Maltese
-  [4, (n) => n==1?0:n==0||n%100>0&&n%100<=10?1:n%100>10&&n%100<20?2:3],
-  // 14: Unused
-  [3, (n) => n%10==1?0:n%10==2?1:2],
-  // 15: Icelandic, Macedonian
-  [2, (n) => n%10==1&&n%100!=11?0:1],
-  // 16: Breton
-  [5, (n) => n%10==1&&n%100!=11&&n%100!=71&&n%100!=91?0:n%10==2&&n%100!=12&&n%100!=72&&n%100!=92?1:(n%10==3||n%10==4||n%10==9)&&n%100!=13&&n%100!=14&&n%100!=19&&n%100!=73&&n%100!=74&&n%100!=79&&n%100!=93&&n%100!=94&&n%100!=99?2:n%1000000==0&&n!=0?3:4],
-  // 17: Shuar
-  [2, (n) => n!=0?1:0],
-  // 18: Welsh
-  [6, (n) => n==0?0:n==1?1:n==2?2:n==3?3:n==6?4:5],
-  // 19: Bosnian, Croatian, Serbian
-  [3, (n) => n % 10 == 1 && n % 100 != 11 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2],
-];
-
-const PluralForm = {
-  /**
-   * Get the correct plural form of a word based on the number
-   *
-   * @param aNum
-   *        The number to decide which plural form to use
-   * @param aWords
-   *        A semi-colon (;) separated string of words to pick the plural form
-   * @return The appropriate plural form of the word
-   */
-  get get()
-  {
-    // This method will lazily load to avoid perf when it is first needed and
-    // creates getPluralForm function. The function it creates is based on the
-    // value of pluralRule specified in the intl stringbundle.
-    // See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
-
-    // Delete the getters to be overwritten
-    delete this.numForms;
-    delete this.get;
-
-    // Make the plural form get function and set it as the default get
-    [this.get, this.numForms] = this.makeGetter(this.ruleNum);
-    return this.get;
-  },
-
-  /**
-   * Create a pair of plural form functions for the given plural rule number.
-   *
-   * @param aRuleNum
-   *        The plural rule number to create functions
-   * @return A pair: [function that gets the right plural form,
-   *                  function that returns the number of plural forms]
-   */
-  makeGetter: function(aRuleNum)
-  {
-    // Default to "all plural" if the value is out of bounds or invalid
-    if (aRuleNum < 0 || aRuleNum >= gFunctions.length || isNaN(aRuleNum)) {
-      log(["Invalid rule number: ", aRuleNum, " -- defaulting to 0"]);
-      aRuleNum = 0;
-    }
-
-    // Get the desired pluralRule function
-    let [numForms, pluralFunc] = gFunctions[aRuleNum];
-
-    // Return functions that give 1) the number of forms and 2) gets the right
-    // plural form
-    return [function(aNum, aWords) {
-      // Figure out which index to use for the semi-colon separated words
-      let index = pluralFunc(aNum ? Number(aNum) : 0);
-      let words = aWords ? aWords.split(/;/) : [""];
-
-      // Explicitly check bounds to avoid strict warnings
-      let ret = index < words.length ? words[index] : undefined;
-
-      // Check for array out of bounds or empty strings
-      if ((ret == undefined) || (ret == "")) {
-        // Display a message in the error console
-        log(["Index #", index, " of '", aWords, "' for value ", aNum,
-            " is invalid -- plural rule #", aRuleNum, ";"]);
-
-        // Default to the first entry (which might be empty, but not undefined)
-        ret = words[0];
-      }
-
-      return ret;
-    }, () => numForms];
-  },
-
-  /**
-   * Get the number of forms for the current plural rule
-   *
-   * @return The number of forms
-   */
-  get numForms()
-  {
-    // We lazily load numForms, so trigger the init logic with get()
-    this.get();
-    return this.numForms;
-  },
-
-  /**
-   * Get the plural rule number from the intl stringbundle
-   *
-   * @return The plural rule number
-   */
-  get ruleNum()
-  {
-    try {
-      return parseInt(L10N.getStr("pluralRule"), 10);
-    } catch (e) {
-    // Fallback to English if the pluralRule property is not available.
-      return 1;
-    }
-  }
-};
-
-/**
- * Private helper function to log errors to the error console and command line
- *
- * @param aMsg
- *        Error message to log or an array of strings to concat
- */
-function log(aMsg)
-{
-  let msg = "plural-form.js: " + (aMsg.join ? aMsg.join("") : aMsg);
-  console.log(msg + "\n");
-}
-
-module.exports = PluralForm;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/prefs.js
+++ /dev/null
@@ -1,187 +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/. */
-
-const Services = require("devtools-services");
-const EventEmitter = require("./utils/event-emitter");
-
-/**
- * Shortcuts for lazily accessing and setting various preferences.
- * Usage:
- *   let prefs = new Prefs("root.path.to.branch", {
- *     myIntPref: ["Int", "leaf.path.to.my-int-pref"],
- *     myCharPref: ["Char", "leaf.path.to.my-char-pref"],
- *     myJsonPref: ["Json", "leaf.path.to.my-json-pref"],
- *     myFloatPref: ["Float", "leaf.path.to.my-float-pref"]
- *     ...
- *   });
- *
- * Get/set:
- *   prefs.myCharPref = "foo";
- *   let aux = prefs.myCharPref;
- *
- * Observe:
- *   prefs.registerObserver();
- *   prefs.on("pref-changed", (prefName, prefValue) => {
- *     ...
- *   });
- *
- * @param string prefsRoot
- *        The root path to the required preferences branch.
- * @param object prefsBlueprint
- *        An object containing { accessorName: [prefType, prefName, prefDefault] } keys.
- */
-function PrefsHelper(prefsRoot = "", prefsBlueprint = {}) {
-  EventEmitter.decorate(this);
-
-  let cache = new Map();
-
-  for (let accessorName in prefsBlueprint) {
-    let [prefType, prefName, prefDefault] = prefsBlueprint[accessorName];
-    map(this, cache, accessorName, prefType, prefsRoot, prefName, prefDefault);
-  }
-
-  let observer = makeObserver(this, cache, prefsRoot, prefsBlueprint);
-  this.registerObserver = () => observer.register();
-  this.unregisterObserver = () => observer.unregister();
-}
-
-/**
- * Helper method for getting a pref value.
- *
- * @param Map cache
- * @param string prefType
- * @param string prefsRoot
- * @param string prefName
- * @return any
- */
-function get(cache, prefType, prefsRoot, prefName) {
-  let cachedPref = cache.get(prefName);
-  if (cachedPref !== undefined) {
-    return cachedPref;
-  }
-  let value = Services.prefs["get" + prefType + "Pref"](
-    [prefsRoot, prefName].join(".")
-  );
-  cache.set(prefName, value);
-  return value;
-}
-
-/**
- * Helper method for setting a pref value.
- *
- * @param Map cache
- * @param string prefType
- * @param string prefsRoot
- * @param string prefName
- * @param any value
- */
-function set(cache, prefType, prefsRoot, prefName, value) {
-  Services.prefs["set" + prefType + "Pref"](
-    [prefsRoot, prefName].join("."),
-    value
-  );
-  cache.set(prefName, value);
-}
-
-/**
- * Maps a property name to a pref, defining lazy getters and setters.
- * Supported types are "Bool", "Char", "Int", "Float" (sugar around "Char"
- * type and casting), and "Json" (which is basically just sugar for "Char"
- * using the standard JSON serializer).
- *
- * @param PrefsHelper self
- * @param Map cache
- * @param string accessorName
- * @param string prefType
- * @param string prefsRoot
- * @param string prefName
- * @param string prefDefault
- * @param array serializer [optional]
- */
-function map(self, cache, accessorName, prefType, prefsRoot, prefName, prefDefault,
-             serializer = { in: e => e, out: e => e }) {
-  if (prefName in self) {
-    throw new Error(`Can't use ${prefName} because it overrides a property` +
-                    "on the instance.");
-  }
-  if (prefType == "Json") {
-    map(self, cache, accessorName, "String", prefsRoot, prefName, prefDefault, {
-      in: JSON.parse,
-      out: JSON.stringify
-    });
-    return;
-  }
-  if (prefType == "Float") {
-    map(self, cache, accessorName, "Char", prefsRoot, prefName, prefDefault, {
-      in: Number.parseFloat,
-      out: (n) => n + ""
-    });
-    return;
-  }
-
-  Object.defineProperty(self, accessorName, {
-    get: () => {
-      try {
-        return serializer.in(get(cache, prefType, prefsRoot, prefName));
-      } catch (e) {
-        if (typeof prefDefault !== 'undefined') {
-          return prefDefault;
-        }
-        throw e;
-      }
-    },
-    set: (e) => set(cache, prefType, prefsRoot, prefName, serializer.out(e))
-  });
-}
-
-/**
- * Finds the accessor for the provided pref, based on the blueprint object
- * used in the constructor.
- *
- * @param PrefsHelper self
- * @param object prefsBlueprint
- * @return string
- */
-function accessorNameForPref(somePrefName, prefsBlueprint) {
-  for (let accessorName in prefsBlueprint) {
-    let [, prefName] = prefsBlueprint[accessorName];
-    if (somePrefName == prefName) {
-      return accessorName;
-    }
-  }
-  return "";
-}
-
-/**
- * Creates a pref observer for `self`.
- *
- * @param PrefsHelper self
- * @param Map cache
- * @param string prefsRoot
- * @param object prefsBlueprint
- * @return object
- */
-function makeObserver(self, cache, prefsRoot, prefsBlueprint) {
-  return {
-    register: function() {
-      this._branch = Services.prefs.getBranch(prefsRoot + ".");
-      this._branch.addObserver("", this);
-    },
-    unregister: function() {
-      this._branch.removeObserver("", this);
-    },
-    observe: function(subject, topic, prefName) {
-      // If this particular pref isn't handled by the blueprint object,
-      // even though it's in the specified branch, ignore it.
-      let accessorName = accessorNameForPref(prefName, prefsBlueprint);
-      if (!(accessorName in self)) {
-        return;
-      }
-      cache.delete(prefName);
-      self.emit("pref-changed", accessorName, self[accessorName]);
-    }
-  };
-}
-
-exports.PrefsHelper = PrefsHelper;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/saveAs.js
+++ /dev/null
@@ -1,5 +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/. */
-
-module.exports = () => {}

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/helpers/local-storage-mock.js
+++ /dev/null
@@ -1,30 +0,0 @@
-var localStorageMock = (() => {
-  let store = {};
-  return {
-    getItem: (key) => {
-      if (!store.hasOwnProperty(key)) {
-        return "";
-      }
-      return store[key];
-    },
-    setItem: (key, value) => {
-      store[key] = value.toString();
-    },
-    clear: () => {
-      store = {};
-    },
-    removeItem: (key) => {
-      delete store[key];
-    },
-    key: (index) => {
-      return Object.keys(store)[index];
-    },
-    get length() {
-      return Object.keys(store).length;
-    }
-  };
-})();
-
-Object.defineProperty(window, "localStorage", {
-  value: localStorageMock
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/prefs-helper.js
+++ /dev/null
@@ -1,37 +0,0 @@
-const { PrefsHelper } = require("../prefs");
-const Services = require("devtools-services");
-const pref = Services.pref;
-
-describe("prefs helper", () => {
-  beforeEach(() => {});
-
-  afterEach(() => {
-    localStorage.clear();
-  });
-
-  it("supports fallback values", () => {
-    pref("devtools.valid", "{\"valid\": true}");
-    pref("devtools.invalid", "{not valid at all]");
-    pref("devtools.nodefault", "{not valid at all]");
-    pref("devtools.validnodefault", "{\"nodefault\": true}");
-
-    const prefs = new PrefsHelper("devtools", {
-      valid: ["Json", "valid", {valid: true}],
-      invalid: ["Json", "invalid", {}],
-      nodefault: ["Json", "nodefault"],
-      validnodefault: ["Json", "validnodefault"],
-    });
-
-    // Valid Json pref should return the actual value
-    expect(prefs.valid).toEqual({valid: true});
-
-    // Invalid Json pref with a fallback shoud return the fallback value
-    expect(prefs.invalid).toEqual({});
-
-    // Invalid Json pref with no fallback should throw
-    expect(() => prefs.nodefault).toThrow();
-
-    // Valid Json pref with no fallback should return the value
-    expect(prefs.validnodefault).toEqual({nodefault: true});
-  });
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/services-prefs.js
+++ /dev/null
@@ -1,200 +0,0 @@
-const Services = require("devtools-services");
-const pref = Services.pref;
-
-describe("services prefs shim", () => {
-  beforeEach(() => {
-    // Add some starter prefs.
-    localStorage.setItem("Services.prefs:devtools.branch1.somebool", JSON.stringify({
-      // bool
-      type: 128,
-      defaultValue: false,
-      hasUserValue: false,
-      userValue: false
-    }));
-
-    localStorage.setItem("Services.prefs:devtools.branch1.somestring", JSON.stringify({
-      // string
-      type: 32,
-      defaultValue: "dinosaurs",
-      hasUserValue: true,
-      userValue: "elephants"
-    }));
-
-    localStorage.setItem("Services.prefs:devtools.branch2.someint", JSON.stringify({
-      // int
-      type: 64,
-      defaultValue: -16,
-      hasUserValue: false,
-      userValue: null
-    }));
-  });
-
-  afterEach(() => {
-    localStorage.clear();
-  });
-
-  it("can get and set preferences", () => {
-    expect(Services.prefs.getBoolPref("devtools.branch1.somebool")).toBe(false);
-    Services.prefs.setBoolPref("devtools.branch1.somebool", true);
-    expect(Services.prefs.getBoolPref("devtools.branch1.somebool")).toBe(true);
-
-    Services.prefs.clearUserPref("devtools.branch1.somestring");
-    expect(Services.prefs.getCharPref("devtools.branch1.somestring")).toBe("dinosaurs");
-
-    expect(Services.prefs.prefHasUserValue("devtools.branch1.somebool")).toBe(true,
-      "bool pref has user value");
-    expect(Services.prefs.prefHasUserValue("devtools.branch1.somestring")).toBe(false,
-      "string pref does not have user value");
-
-    // String prefs actually differ from Char prefs in the real implementation of
-    // Services.prefs, but for this shim, both are using the same implementation.
-    Services.prefs.setStringPref("devtools.branch1.somerealstring", "abcdef");
-    expect(Services.prefs.getStringPref("devtools.branch1.somerealstring")).toBe("abcdef");
-  });
-
-  it("can call savePrefFile without crashing", () => {
-    Services.prefs.savePrefFile(null);
-  });
-
-  it("can use branches", () => {
-    let branch0 = Services.prefs.getBranch(null);
-    let branch1 = Services.prefs.getBranch("devtools.branch1.");
-
-    branch1.setCharPref("somestring", "octopus");
-    Services.prefs.setCharPref("devtools.branch1.somestring", "octopus");
-    expect(Services.prefs.getCharPref("devtools.branch1.somestring")).toEqual("octopus");
-    expect(branch0.getCharPref("devtools.branch1.somestring")).toEqual("octopus");
-    expect(branch1.getCharPref("somestring")).toEqual("octopus");
-  });
-
-  it("throws exceptions when expected", () => {
-    expect(() => {
-      Services.prefs.setIntPref("devtools.branch1.somebool", 27);
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.setBoolPref("devtools.branch1.somebool", 27);
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.getCharPref("devtools.branch2.someint");
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.setCharPref("devtools.branch2.someint", "whatever");
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.setIntPref("devtools.branch2.someint", "whatever");
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.getBoolPref("devtools.branch1.somestring");
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.setBoolPref("devtools.branch1.somestring", true);
-    }).toThrow();
-
-    expect(() => {
-      Services.prefs.setCharPref("devtools.branch1.somestring", true);
-    }).toThrow();
-  });
-
-  it("returns correct pref types", () => {
-    expect(Services.prefs.getPrefType("devtools.branch1.somebool"))
-        .toEqual(Services.prefs.PREF_BOOL);
-    expect(Services.prefs.getPrefType("devtools.branch2.someint"))
-        .toEqual(Services.prefs.PREF_INT);
-    expect(Services.prefs.getPrefType("devtools.branch1.somestring"))
-        .toEqual(Services.prefs.PREF_STRING);
-  });
-
-  it("supports observers", () => {
-    let notifications = {};
-    let clearNotificationList = () => {
-      notifications = {};
-    };
-
-    let observer = {
-      observe: function (subject, topic, data) {
-        notifications[data] = true;
-      }
-    };
-
-    let branch0 = Services.prefs.getBranch(null);
-    let branch1 = Services.prefs.getBranch("devtools.branch1.");
-
-    branch0.addObserver("devtools.branch1", null, null);
-    branch0.addObserver("devtools.branch1.", observer);
-    branch1.addObserver("", observer);
-
-    Services.prefs.setCharPref("devtools.branch1.somestring", "elf owl");
-    expect(notifications).toEqual({
-      "devtools.branch1.somestring": true,
-      "somestring": true
-    }, "notifications sent to two listeners");
-
-    clearNotificationList();
-    Services.prefs.setIntPref("devtools.branch2.someint", 1729);
-    expect(notifications).toEqual({}, "no notifications sent");
-
-    clearNotificationList();
-    branch0.removeObserver("devtools.branch1.", observer);
-    Services.prefs.setCharPref("devtools.branch1.somestring", "tapir");
-    expect(notifications).toEqual({
-      "somestring": true
-    }, "removeObserver worked");
-
-    clearNotificationList();
-    branch0.addObserver("devtools.branch1.somestring", observer);
-    Services.prefs.setCharPref("devtools.branch1.somestring", "northern shoveler");
-    expect(notifications).toEqual({
-      "devtools.branch1.somestring": true,
-      "somestring": true
-    }, "notifications sent to two listeners");
-    branch0.removeObserver("devtools.branch1.somestring", observer);
-
-    // Make sure we update if the pref change comes from somewhere else.
-    clearNotificationList();
-    pref("devtools.branch1.someotherstring", "lazuli bunting");
-    expect(notifications).toEqual({
-      "someotherstring": true
-    }, "pref worked");
-  });
-
-  it("does not crash when setting prefs (bug 1296427)", () => {
-    // Regression test for bug 1296427.
-    pref("devtools.hud.loglimit", 1000);
-    pref("devtools.hud.loglimit.network", 1000);
-  });
-
-  it("fixes observer bug (bug 1319150)", () => {
-    // Regression test for bug 1319150.
-    let seen = false;
-    let fnObserver = () => {
-      seen = true;
-    };
-
-    let branch0 = Services.prefs.getBranch(null);
-    branch0.addObserver("devtools.branch1.somestring", fnObserver);
-    Services.prefs.setCharPref("devtools.branch1.somestring", "common merganser");
-    expect(seen).toBe(true);
-    branch0.removeObserver("devtools.branch1.somestring", fnObserver);
-  });
-
-  it("supports default value argument", () => {
-    // Check support for default values
-    let intPrefWithDefault =
-        Services.prefs.getIntPref("devtools.branch1.missing", 1);
-    expect(intPrefWithDefault).toEqual(1);
-
-    let charPrefWithDefault =
-        Services.prefs.getCharPref("devtools.branch1.missing", "test");
-    expect(charPrefWithDefault).toEqual("test");
-
-    let boolPrefWithDefault =
-        Services.prefs.getBoolPref("devtools.branch1.missing", true);
-    expect(boolPrefWithDefault).toBe(true);
-  });
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/services-telemetry.js
+++ /dev/null
@@ -1,41 +0,0 @@
-const Services = require("devtools-services");
-
-// const pref = Services;
-
-describe("services telemetry shim", () => {
-  beforeEach(() => {
-    telemetry.scalars = {};
-    telemetry.histograms = {};
-  });
-
-  it("getHistogramById", () => {
-    const hist = Services.telemetry.getHistogramById("foo");
-    hist.add(3);
-    expect(telemetry.histograms.foo).toEqual([3]);
-
-    hist.add(3);
-    expect(telemetry.histograms.foo).toEqual([3, 3]);
-  });
-
-  it("getKeyedHistogramById", () => {
-    const hist = Services.telemetry.getKeyedHistogramById("foo");
-    hist.add("a", 3);
-    expect(telemetry.histograms.foo.a).toEqual([3]);
-
-    hist.add("a", 3);
-    expect(telemetry.histograms.foo.a).toEqual([3, 3]);
-  });
-
-  it("scalarSet", () => {
-    Services.telemetry.scalarSet("foo", 3);
-    expect(telemetry.scalars.foo).toEqual(3);
-  });
-
-  it("scalarAdd", () => {
-    Services.telemetry.scalarAdd("foo", 3);
-    expect(telemetry.scalars.foo).toEqual(3);
-
-    Services.telemetry.scalarAdd("foo", 3);
-    expect(telemetry.scalars.foo).toEqual(6);
-  });
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/telemetry.js
+++ /dev/null
@@ -1,120 +0,0 @@
-const Telemetry = require("../utils/telemetry");
-const telemetry = new Telemetry();
-
-describe("telemetry shim", () => {
-  it("msSystemNow", () => {
-    expect(() => {
-      telemetry.msSystemNow;
-    }).not.toThrow();
-  });
-
-  it("start", () => {
-    expect(() => {
-      telemetry.start("foo", this);
-    }).not.toThrow();
-  });
-
-  it("startKeyed", () => {
-    expect(() => {
-      telemetry.startKeyed("foo", "bar", this);
-    }).not.toThrow();
-  });
-
-  it("finish", () => {
-    expect(() => {
-      telemetry.finish("foo", this);
-    }).not.toThrow();
-  });
-
-  it("finishKeyed", () => {
-    expect(() => {
-      telemetry.finishKeyed("foo", "bar", this);
-    }).not.toThrow();
-  });
-
-  it("getHistogramById", () => {
-    expect(() => {
-      telemetry.getHistogramById("foo").add(3);
-    }).not.toThrow();
-  });
-
-  it("getKeyedHistogramById", () => {
-    expect(() => {
-      telemetry.getKeyedHistogramById("foo").add("foo", 3);
-    }).not.toThrow();
-  });
-
-  it("scalarSet", () => {
-    expect(() => {
-      telemetry.scalarSet("foo", 3);
-    }).not.toThrow();
-  });
-
-  it("scalarAdd", () => {
-    expect(() => {
-      telemetry.scalarAdd("foo", 3);
-    }).not.toThrow();
-  });
-
-  it("keyedScalarAdd", () => {
-    expect(() => {
-      telemetry.keyedScalarAdd("foo", "bar", 3);
-    }).not.toThrow();
-  });
-
-  it("setEventRecordingEnabled", () => {
-    expect(() => {
-      telemetry.setEventRecordingEnabled("foo", true);
-    }).not.toThrow();
-  });
-
-  it("preparePendingEvent", () => {
-    expect(() => {
-      telemetry.preparePendingEvent(
-        "devtools.main", "open", "inspector", null, ["foo", "bar"]);
-    }).not.toThrow();
-  });
-
-  it("addEventProperty", () => {
-    expect(() => {
-      telemetry.addEventProperty(
-        "devtools.main", "open", "inspector", "foo", "1");
-    }).not.toThrow();
-  });
-
-  it("addEventProperties", () => {
-    expect(() => {
-      telemetry.addEventProperties("devtools.main", "open", "inspector", {
-        "foo": "1",
-        "bar": "2"
-      });
-    }).not.toThrow();
-  });
-
-  it("_sendPendingEvent", () => {
-    expect(() => {
-      telemetry._sendPendingEvent("devtools.main", "open", "inspector", null);
-    }).not.toThrow();
-  });
-
-  it("recordEvent", () => {
-    expect(() => {
-      telemetry.recordEvent("devtools.main", "open", "inspector", null, {
-        "foo": "1",
-        "bar": "2"
-      });
-    }).not.toThrow();
-  });
-
-  it("toolOpened", () => {
-    expect(() => {
-      telemetry.toolOpened("foo");
-    }).not.toThrow();
-  });
-
-  it("toolClosed", () => {
-    expect(() => {
-      telemetry.toolClosed("foo");
-    }).not.toThrow();
-  });
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/tests/unicode-url.js
+++ /dev/null
@@ -1,228 +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/. */
-
-const { getUnicodeUrl, getUnicodeUrlPath, getUnicodeHostname } =
-  require("../unicode-url");
-
-describe("unicode-url", () => {
-  // List of URLs used to test Unicode URL conversion
-  const TEST_URLS = [
-    // Type:     Readable ASCII URLs
-    // Expected: All of Unicode versions should equal to the raw.
-    {
-      raw: "https://example.org",
-      expectedUnicode: "https://example.org",
-    },
-    {
-      raw: "http://example.org",
-      expectedUnicode: "http://example.org",
-    },
-    {
-      raw: "ftp://example.org",
-      expectedUnicode: "ftp://example.org",
-    },
-    {
-      raw: "https://example.org.",
-      expectedUnicode: "https://example.org.",
-    },
-    {
-      raw: "https://example.org/",
-      expectedUnicode: "https://example.org/",
-    },
-    {
-      raw: "https://example.org/test",
-      expectedUnicode: "https://example.org/test",
-    },
-    {
-      raw: "https://example.org/test.html",
-      expectedUnicode: "https://example.org/test.html",
-    },
-    {
-      raw: "https://example.org/test.html?one=1&two=2",
-      expectedUnicode: "https://example.org/test.html?one=1&two=2",
-    },
-    {
-      raw: "https://example.org/test.html#here",
-      expectedUnicode: "https://example.org/test.html#here",
-    },
-    {
-      raw: "https://example.org/test.html?one=1&two=2#here",
-      expectedUnicode: "https://example.org/test.html?one=1&two=2#here",
-    },
-    // Type:     Unreadable URLs with either Punycode domain names or URI-encoded
-    //           paths
-    // Expected: Unreadable domain names and URI-encoded paths should be converted
-    //           to readable Unicode.
-    {
-      raw: "https://xn--g6w.xn--8pv/test.html",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "https://\u6e2c.\u672c/test.html",
-    },
-    {
-      raw: "https://example.org/%E6%B8%AC%E8%A9%A6.html",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "https://example.org/\u6e2c\u8a66.html",
-    },
-    {
-      raw: "https://example.org/test.html?One=%E4%B8%80",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "https://example.org/test.html?One=\u4e00",
-    },
-    {
-      raw: "https://example.org/test.html?%E4%B8%80=1",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "https://example.org/test.html?\u4e00=1",
-    },
-    {
-      raw: "https://xn--g6w.xn--8pv/%E6%B8%AC%E8%A9%A6.html" +
-           "?%E4%B8%80=%E4%B8%80" +
-           "#%E6%AD%A4",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "https://\u6e2c.\u672c/\u6e2c\u8a66.html" +
-                       "?\u4e00=\u4e00" +
-                       "#\u6b64",
-    },
-    // Type:     data: URIs
-    // Expected: All should not be converted.
-    {
-      raw: "data:text/plain;charset=UTF-8;Hello%20world",
-      expectedUnicode: "data:text/plain;charset=UTF-8;Hello%20world",
-    },
-    {
-      raw: "data:text/plain;charset=UTF-8;%E6%B8%AC%20%E8%A9%A6",
-      expectedUnicode: "data:text/plain;charset=UTF-8;%E6%B8%AC%20%E8%A9%A6",
-    },
-    {
-      raw: "data:image/png;base64,iVBORw0KGgoAAA" +
-           "ANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4" +
-           "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU" +
-           "5ErkJggg==",
-      expectedUnicode: "data:image/png;base64,iVBORw0KGgoAAA" +
-                       "ANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4" +
-                       "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU" +
-                       "5ErkJggg==",
-    },
-    // Type:     Malformed URLs
-    // Expected: All should not be converted.
-    {
-      raw: "://example.org/test",
-      expectedUnicode: "://example.org/test",
-    },
-    {
-      raw: "://xn--g6w.xn--8pv/%E6%B8%AC%E8%A9%A6.html" +
-           "?%E4%B8%80=%E4%B8%80",
-      expectedUnicode: "://xn--g6w.xn--8pv/%E6%B8%AC%E8%A9%A6.html" +
-                       "?%E4%B8%80=%E4%B8%80",
-    },
-    {
-      // %E8%A9 isn't a valid UTF-8 code, so this URL is malformed.
-      raw: "https://xn--g6w.xn--8pv/%E6%B8%AC%E8%A9",
-      expectedUnicode: "https://xn--g6w.xn--8pv/%E6%B8%AC%E8%A9",
-    },
-  ];
-
-  // List of hostanmes used to test Unicode hostname conversion
-  const TEST_HOSTNAMES = [
-    // Type:     Readable ASCII hostnames
-    // Expected: All of Unicode versions should equal to the raw.
-    {
-      raw: "example",
-      expectedUnicode: "example",
-    },
-    {
-      raw: "example.org",
-      expectedUnicode: "example.org",
-    },
-    // Type:     Unreadable Punycode hostnames
-    // Expected: Punycode should be converted to readable Unicode.
-    {
-      raw: "xn--g6w",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "\u6e2c",
-    },
-    {
-      raw: "xn--g6w.xn--8pv",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "\u6e2c.\u672c",
-    },
-  ];
-
-  // List of URL paths used to test Unicode URL path conversion
-  const TEST_URL_PATHS = [
-    // Type:     Readable ASCII URL paths
-    // Expected: All of Unicode versions should equal to the raw.
-    {
-      raw: "test",
-      expectedUnicode: "test",
-    },
-    {
-      raw: "/",
-      expectedUnicode: "/",
-    },
-    {
-      raw: "/test",
-      expectedUnicode: "/test",
-    },
-    {
-      raw: "/test.html?one=1&two=2#here",
-      expectedUnicode: "/test.html?one=1&two=2#here",
-    },
-    // Type:     Unreadable URI-encoded URL paths
-    // Expected: URL paths should be converted to readable Unicode.
-    {
-      raw: "/%E6%B8%AC%E8%A9%A6",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "/\u6e2c\u8a66",
-    },
-    {
-      raw: "/%E6%B8%AC%E8%A9%A6.html",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "/\u6e2c\u8a66.html",
-    },
-    {
-      raw: "/%E6%B8%AC%E8%A9%A6.html" +
-           "?%E4%B8%80=%E4%B8%80&%E4%BA%8C=%E4%BA%8C" +
-           "#%E6%AD%A4",
-      // Do not type Unicode characters directly, because this test file isn't
-      // specified with a known encoding.
-      expectedUnicode: "/\u6e2c\u8a66.html" +
-                       "?\u4e00=\u4e00&\u4e8c=\u4e8c" +
-                       "#\u6b64",
-    },
-    // Type:     Malformed URL paths
-    // Expected: All should not be converted.
-    {
-      // %E8%A9 isn't a valid UTF-8 code, so this URL is malformed.
-      raw: "/%E6%B8%AC%E8%A9",
-      expectedUnicode: "/%E6%B8%AC%E8%A9",
-    },
-  ];
-
-  it("Get Unicode URLs", () => {
-    for (let url of TEST_URLS) {
-      expect(getUnicodeUrl(url.raw)).toBe(url.expectedUnicode);
-    }
-  });
-
-  it("Get Unicode hostnames", () => {
-    for (let hostname of TEST_HOSTNAMES) {
-      expect(getUnicodeHostname(hostname.raw)).toBe(hostname.expectedUnicode);
-    }
-  });
-
-  it("Get Unicode URL paths", () => {
-    for (let urlPath of TEST_URL_PATHS) {
-      expect(getUnicodeUrlPath(urlPath.raw)).toBe(urlPath.expectedUnicode);
-    }
-  });
-});

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/unicode-url.js
+++ /dev/null
@@ -1,115 +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/. */
-
-// This file is a chrome-API-free version of the module
-// devtools/client/shared/unicode-url.js in the mozilla-central repository, so
-// that it can be used in Chrome-API-free applications, such as the Launchpad.
-// But because of this, it cannot take advantage of utilizing chrome APIs and
-// should implement the similar functionalities on its own.
-//
-// Please keep in mind that if the feature in this file has changed, don't
-// forget to also change that accordingly in
-// devtools/client/shared/unicode-url.js in the mozilla-central repository.
-
-"use strict";
-
-const punycode = require("punycode");
-
-/**
- * Gets a readble Unicode hostname from a hostname.
- *
- * If the `hostname` is a readable ASCII hostname, such as example.org, then
- * this function will simply return the original `hostname`.
- *
- * If the `hostname` is a Punycode hostname representing a Unicode domain name,
- * such as xn--g6w.xn--8pv, then this function will return the readable Unicode
- * domain name by decoding the Punycode hostname.
- *
- * @param {string}  hostname
- *                  the hostname from which the Unicode hostname will be
- *                  parsed, such as example.org, xn--g6w.xn--8pv.
- * @return {string} The Unicode hostname. It may be the same as the `hostname`
- *                  passed to this function if the `hostname` itself is
- *                  a readable ASCII hostname or a Unicode hostname.
- */
-function getUnicodeHostname(hostname) {
-  try {
-    return punycode.toUnicode(hostname);
-  } catch (err) {
-  }
-  return hostname;
-}
-
-/**
- * Gets a readble Unicode URL pathname from a URL pathname.
- *
- * If the `urlPath` is a readable ASCII URL pathname, such as /a/b/c.js, then
- * this function will simply return the original `urlPath`.
- *
- * If the `urlPath` is a URI-encoded pathname, such as %E8%A9%A6/%E6%B8%AC.js,
- * then this function will return the readable Unicode pathname.
- *
- * If the `urlPath` is a malformed URL pathname, then this function will simply
- * return the original `urlPath`.
- *
- * @param {string}  urlPath
- *                  the URL path from which the Unicode URL path will be parsed,
- *                  such as /a/b/c.js, %E8%A9%A6/%E6%B8%AC.js.
- * @return {string} The Unicode URL Path. It may be the same as the `urlPath`
- *                  passed to this function if the `urlPath` itself is a readable
- *                  ASCII url or a Unicode url.
- */
-function getUnicodeUrlPath(urlPath) {
-  try {
-    return decodeURIComponent(urlPath);
-  } catch (err) {
-  }
-  return urlPath;
-}
-
-/**
- * Gets a readable Unicode URL from a URL.
- *
- * If the `url` is a readable ASCII URL, such as http://example.org/a/b/c.js,
- * then this function will simply return the original `url`.
- *
- * If the `url` includes either an unreadable Punycode domain name or an
- * unreadable URI-encoded pathname, such as
- * http://xn--g6w.xn--8pv/%E8%A9%A6/%E6%B8%AC.js, then this function will return
- * the readable URL by decoding all its unreadable URL components to Unicode
- * characters.
- *
- * If the `url` is a malformed URL, then this function will return the original
- * `url`.
- *
- * If the `url` is a data: URI, then this function will return the original
- * `url`.
- *
- * @param {string}  url
- *                  the full URL, or a data: URI. from which the readable URL
- *                  will be parsed, such as, http://example.org/a/b/c.js,
- *                  http://xn--g6w.xn--8pv/%E8%A9%A6/%E6%B8%AC.js
- * @return {string} The readable URL. It may be the same as the `url` passed to
- *                  this function if the `url` itself is readable.
- */
-function getUnicodeUrl(url) {
-  try {
-    const { protocol, hostname } = new URL(url);
-    if (protocol === "data:") {
-      // Never convert a data: URI.
-      return url;
-    }
-    const readableHostname = getUnicodeHostname(hostname);
-    url = decodeURIComponent(url);
-    return url.replace(hostname, readableHostname);
-  } catch (err) {
-  }
-  return url;
-}
-
-module.exports = {
-  getUnicodeHostname,
-  getUnicodeUrlPath,
-  getUnicodeUrl,
-};

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/utils/defer.js
+++ /dev/null
@@ -1,25 +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";
-
-// See bug 1273941 to understand this choice of promise.
-const Promise = require("../sham/promise");
-
-/**
- * Returns a deferred object, with a resolve and reject property.
- * https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Promise.jsm/Deferred
- */
-module.exports = function defer() {
-  let resolve, reject;
-  let promise = new Promise(function () {
-    resolve = arguments[0];
-    reject = arguments[1];
-  });
-  return {
-    resolve: resolve,
-    reject: reject,
-    promise: promise
-  };
-};

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/utils/event-emitter.js
+++ /dev/null
@@ -1,127 +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/. */
-
-var EventEmitter = function EventEmitter() {};
-module.exports = EventEmitter;
-
-const promise = require("./promise");
-
-/**
- * Decorate an object with event emitter functionality.
- *
- * @param Object aObjectToDecorate
- *        Bind all public methods of EventEmitter to
- *        the aObjectToDecorate object.
- */
-EventEmitter.decorate = function EventEmitter_decorate (aObjectToDecorate) {
-  let emitter = new EventEmitter();
-  aObjectToDecorate.on = emitter.on.bind(emitter);
-  aObjectToDecorate.off = emitter.off.bind(emitter);
-  aObjectToDecorate.once = emitter.once.bind(emitter);
-  aObjectToDecorate.emit = emitter.emit.bind(emitter);
-};
-
-EventEmitter.prototype = {
-  /**
-   * Connect a listener.
-   *
-   * @param string aEvent
-   *        The event name to which we're connecting.
-   * @param function aListener
-   *        Called when the event is fired.
-   */
-  on: function EventEmitter_on(aEvent, aListener) {
-    if (!this._eventEmitterListeners)
-      this._eventEmitterListeners = new Map();
-    if (!this._eventEmitterListeners.has(aEvent)) {
-      this._eventEmitterListeners.set(aEvent, []);
-    }
-    this._eventEmitterListeners.get(aEvent).push(aListener);
-  },
-
-  /**
-   * Listen for the next time an event is fired.
-   *
-   * @param string aEvent
-   *        The event name to which we're connecting.
-   * @param function aListener
-   *        (Optional) Called when the event is fired. Will be called at most
-   *        one time.
-   * @return promise
-   *        A promise which is resolved when the event next happens. The
-   *        resolution value of the promise is the first event argument. If
-   *        you need access to second or subsequent event arguments (it's rare
-   *        that this is needed) then use aListener
-   */
-  once: function EventEmitter_once(aEvent, aListener) {
-    let deferred = promise.defer();
-
-    let handler = (aEvent, aFirstArg, ...aRest) => {
-      this.off(aEvent, handler);
-      if (aListener) {
-        aListener.apply(null, [aEvent, aFirstArg, ...aRest]);
-      }
-      deferred.resolve(aFirstArg);
-    };
-
-    handler._originalListener = aListener;
-    this.on(aEvent, handler);
-
-    return deferred.promise;
-  },
-
-  /**
-   * Remove a previously-registered event listener.  Works for events
-   * registered with either on or once.
-   *
-   * @param string aEvent
-   *        The event name whose listener we're disconnecting.
-   * @param function aListener
-   *        The listener to remove.
-   */
-  off: function EventEmitter_off(aEvent, aListener) {
-    if (!this._eventEmitterListeners)
-      return;
-    let listeners = this._eventEmitterListeners.get(aEvent);
-    if (listeners) {
-      this._eventEmitterListeners.set(aEvent, listeners.filter(l => {
-        return l !== aListener && l._originalListener !== aListener;
-      }));
-    }
-  },
-
-  /**
-   * Emit an event.  All arguments to this method will
-   * be sent to listener functions.
-   */
-  emit: function EventEmitter_emit(aEvent) {
-    if (!this._eventEmitterListeners || !this._eventEmitterListeners.has(aEvent)) {
-      return;
-    }
-
-    let originalListeners = this._eventEmitterListeners.get(aEvent);
-    for (let listener of this._eventEmitterListeners.get(aEvent)) {
-      // If the object was destroyed during event emission, stop
-      // emitting.
-      if (!this._eventEmitterListeners) {
-        break;
-      }
-
-      // If listeners were removed during emission, make sure the
-      // event handler we're going to fire wasn't removed.
-      if (originalListeners === this._eventEmitterListeners.get(aEvent) ||
-          this._eventEmitterListeners.get(aEvent).some(l => l === listener)) {
-        try {
-          listener.apply(null, arguments);
-        }
-        catch (ex) {
-          // Prevent a bad listener from interfering with the others.
-          let msg = ex + ": " + ex.stack;
-          //console.error(msg);
-          console.log(msg);
-        }
-      }
-    }
-  },
-};

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/utils/promise.js
+++ /dev/null
@@ -1,29 +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/. */
-
-/*
- * A sham for https://dxr.mozilla.org/mozilla-central/source/toolkit/modules/Promise.jsm
- */
-
-/**
- * Promise.jsm is mostly the Promise web API with a `defer` method. Just drop this in here,
- * and use the native web API (although building with webpack/babel, it may replace this
- * with it's own version if we want to target environments that do not have `Promise`.
- */
-
-let p = typeof window != "undefined" ? window.Promise : Promise;
-p.defer = function defer() {
-  var resolve, reject;
-  var promise = new Promise(function() {
-    resolve = arguments[0];
-    reject = arguments[1];
-  });
-  return {
-    resolve: resolve,
-    reject: reject,
-    promise: promise,
-  };
-};
-
-module.exports = p;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/utils/task.js
+++ /dev/null
@@ -1,515 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
-/* 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";
-
-/* eslint-disable spaced-comment */
-/* globals StopIteration */
-
-/**
- * This module implements a subset of "Task.js" <http://taskjs.org/>.
- * It is a copy of toolkit/modules/Task.jsm.  Please try not to
- * diverge the API here.
- *
- * Paraphrasing from the Task.js site, tasks make sequential, asynchronous
- * operations simple, using the power of JavaScript's "yield" operator.
- *
- * Tasks are built upon generator functions and promises, documented here:
- *
- * <https://developer.mozilla.org/en/JavaScript/Guide/Iterators_and_Generators>
- * <http://wiki.commonjs.org/wiki/Promises/A>
- *
- * The "Task.spawn" function takes a generator function and starts running it as
- * a task.  Every time the task yields a promise, it waits until the promise is
- * fulfilled.  "Task.spawn" returns a promise that is resolved when the task
- * completes successfully, or is rejected if an exception occurs.
- *
- * -----------------------------------------------------------------------------
- *
- * const {Task} = require("devtools/shared/task");
- *
- * Task.spawn(function* () {
- *
- *   // This is our task. Let's create a promise object, wait on it and capture
- *   // its resolution value.
- *   let myPromise = getPromiseResolvedOnTimeoutWithValue(1000, "Value");
- *   let result = yield myPromise;
- *
- *   // This part is executed only after the promise above is fulfilled (after
- *   // one second, in this imaginary example).  We can easily loop while
- *   // calling asynchronous functions, and wait multiple times.
- *   for (let i = 0; i < 3; i++) {
- *     result += yield getPromiseResolvedOnTimeoutWithValue(50, "!");
- *   }
- *
- *   return "Resolution result for the task: " + result;
- * }).then(function (result) {
- *
- *   // result == "Resolution result for the task: Value!!!"
- *
- *   // The result is undefined if no value was returned.
- *
- * }, function (exception) {
- *
- *   // Failure!  We can inspect or report the exception.
- *
- * });
- *
- * -----------------------------------------------------------------------------
- *
- * This module implements only the "Task.js" interfaces described above, with no
- * additional features to control the task externally, or do custom scheduling.
- * It also provides the following extensions that simplify task usage in the
- * most common cases:
- *
- * - The "Task.spawn" function also accepts an iterator returned by a generator
- *   function, in addition to a generator function.  This way, you can call into
- *   the generator function with the parameters you want, and with "this" bound
- *   to the correct value.  Also, "this" is never bound to the task object when
- *   "Task.spawn" calls the generator function.
- *
- * - In addition to a promise object, a task can yield the iterator returned by
- *   a generator function.  The iterator is turned into a task automatically.
- *   This reduces the syntax overhead of calling "Task.spawn" explicitly when
- *   you want to recurse into other task functions.
- *
- * - The "Task.spawn" function also accepts a primitive value, or a function
- *   returning a primitive value, and treats the value as the result of the
- *   task.  This makes it possible to call an externally provided function and
- *   spawn a task from it, regardless of whether it is an asynchronous generator
- *   or a synchronous function.  This comes in handy when iterating over
- *   function lists where some items have been converted to tasks and some not.
- */
-
-////////////////////////////////////////////////////////////////////////////////
-//// Globals
-
-const Promise = require("../sham/promise");
-const defer = require("./defer");
-
-// The following error types are considered programmer errors, which should be
-// reported (possibly redundantly) so as to let programmers fix their code.
-const ERRORS_TO_REPORT = ["EvalError", "RangeError", "ReferenceError",
-                          "TypeError"];
-
-/**
- * The Task currently being executed
- */
-var gCurrentTask = null;
-
-/**
- * If `true`, capture stacks whenever entering a Task and rewrite the
- * stack any exception thrown through a Task.
- */
-var gMaintainStack = false;
-
-/**
- * Iterate through the lines of a string.
- *
- * @return Iterator<string>
- */
-function* linesOf(string) {
-  let reLine = /([^\r\n])+/g;
-  let match;
-  while ((match = reLine.exec(string))) {
-    yield [match[0], match.index];
-  }
-}
-
-/**
- * Detect whether a value is a generator.
- *
- * @param aValue
- *        The value to identify.
- * @return A boolean indicating whether the value is a generator.
- */
-function isGenerator(value) {
-  return Object.prototype.toString.call(value) == "[object Generator]";
-}
-
-////////////////////////////////////////////////////////////////////////////////
-//// Task
-
-/**
- * This object provides the public module functions.
- */
-var Task = {
-  /**
-   * Creates and starts a new task.
-   *
-   * @param task
-   *        - If you specify a generator function, it is called with no
-   *          arguments to retrieve the associated iterator.  The generator
-   *          function is a task, that is can yield promise objects to wait
-   *          upon.
-   *        - If you specify the iterator returned by a generator function you
-   *          called, the generator function is also executed as a task.  This
-   *          allows you to call the function with arguments.
-   *        - If you specify a function that is not a generator, it is called
-   *          with no arguments, and its return value is used to resolve the
-   *          returned promise.
-   *        - If you specify anything else, you get a promise that is already
-   *          resolved with the specified value.
-   *
-   * @return A promise object where you can register completion callbacks to be
-   *         called when the task terminates.
-   */
-  spawn: function (task) {
-    return createAsyncFunction(task)();
-  },
-
-  /**
-   * Create and return an 'async function' that starts a new task.
-   *
-   * This is similar to 'spawn' except that it doesn't immediately start
-   * the task, it binds the task to the async function's 'this' object and
-   * arguments, and it requires the task to be a function.
-   *
-   * It simplifies the common pattern of implementing a method via a task,
-   * like this simple object with a 'greet' method that has a 'name' parameter
-   * and spawns a task to send a greeting and return its reply:
-   *
-   * let greeter = {
-   *   message: "Hello, NAME!",
-   *   greet: function(name) {
-   *     return Task.spawn((function* () {
-   *       return yield sendGreeting(this.message.replace(/NAME/, name));
-   *     }).bind(this);
-   *   })
-   * };
-   *
-   * With Task.async, the method can be declared succinctly:
-   *
-   * let greeter = {
-   *   message: "Hello, NAME!",
-   *   greet: Task.async(function* (name) {
-   *     return yield sendGreeting(this.message.replace(/NAME/, name));
-   *   })
-   * };
-   *
-   * While maintaining identical semantics:
-   *
-   * greeter.greet("Mitchell").then((reply) => { ... }); // behaves the same
-   *
-   * @param task
-   *        The task function to start.
-   *
-   * @return A function that starts the task function and returns its promise.
-   */
-  async: function (task) {
-    if (typeof (task) != "function") {
-      throw new TypeError("task argument must be a function");
-    }
-
-    return createAsyncFunction(task);
-  },
-
-  /**
-   * Constructs a special exception that, when thrown inside a legacy generator
-   * function (non-star generator), allows the associated task to be resolved
-   * with a specific value.
-   *
-   * Example: throw new Task.Result("Value");
-   */
-  Result: function (value) {
-    this.value = value;
-  }
-};
-
-function createAsyncFunction(task) {
-  let asyncFunction = function () {
-    let result = task;
-    if (task && typeof (task) == "function") {
-      if (task.isAsyncFunction) {
-        throw new TypeError(
-          "Cannot use an async function in place of a promise. " +
-          "You should either invoke the async function first " +
-          "or use 'Task.spawn' instead of 'Task.async' to start " +
-          "the Task and return its promise.");
-      }
-
-      try {
-        // Let's call into the function ourselves.
-        result = task.apply(this, arguments);
-      } catch (ex) {
-        if (ex instanceof Task.Result) {
-          return Promise.resolve(ex.value);
-        }
-        return Promise.reject(ex);
-      }
-    }
-
-    if (isGenerator(result)) {
-      // This is an iterator resulting from calling a generator function.
-      return new TaskImpl(result).deferred.promise;
-    }
-
-    // Just propagate the given value to the caller as a resolved promise.
-    return Promise.resolve(result);
-  };
-
-  asyncFunction.isAsyncFunction = true;
-
-  return asyncFunction;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-//// TaskImpl
-
-/**
- * Executes the specified iterator as a task, and gives access to the promise
- * that is fulfilled when the task terminates.
- */
-function TaskImpl(iterator) {
-  if (gMaintainStack) {
-    this._stack = (new Error()).stack;
-  }
-  this.deferred = defer();
-  this._iterator = iterator;
-  this._isStarGenerator = !("send" in iterator);
-  this._run(true);
-}
-
-TaskImpl.prototype = {
-  /**
-   * Includes the promise object where task completion callbacks are registered,
-   * and methods to resolve or reject the promise at task completion.
-   */
-  deferred: null,
-
-  /**
-   * The iterator returned by the generator function associated with this task.
-   */
-  _iterator: null,
-
-  /**
-   * Whether this Task is using a star generator.
-   */
-  _isStarGenerator: false,
-
-  /**
-   * Main execution routine, that calls into the generator function.
-   *
-   * @param sendResolved
-   *        If true, indicates that we should continue into the generator
-   *        function regularly (if we were waiting on a promise, it was
-   *        resolved). If true, indicates that we should cause an exception to
-   *        be thrown into the generator function (if we were waiting on a
-   *        promise, it was rejected).
-   * @param sendValue
-   *        Resolution result or rejection exception, if any.
-   */
-  _run: function (sendResolved, sendValue) {
-    try {
-      gCurrentTask = this;
-
-      if (this._isStarGenerator) {
-        try {
-          let result = sendResolved ? this._iterator.next(sendValue)
-                                    : this._iterator.throw(sendValue);
-
-          if (result.done) {
-            // The generator function returned.
-            this.deferred.resolve(result.value);
-          } else {
-            // The generator function yielded.
-            this._handleResultValue(result.value);
-          }
-        } catch (ex) {
-          // The generator function failed with an uncaught exception.
-          this._handleException(ex);
-        }
-      } else {
-        try {
-          let yielded = sendResolved ? this._iterator.send(sendValue)
-                                     : this._iterator.throw(sendValue);
-          this._handleResultValue(yielded);
-        } catch (ex) {
-          if (ex instanceof Task.Result) {
-            // The generator function threw the special exception that
-            // allows it to return a specific value on resolution.
-            this.deferred.resolve(ex.value);
-          } else if (ex instanceof StopIteration) {
-            // The generator function terminated with no specific result.
-            this.deferred.resolve(undefined);
-          } else {
-            // The generator function failed with an uncaught exception.
-            this._handleException(ex);
-          }
-        }
-      }
-    } finally {
-      //
-      // At this stage, the Task may have finished executing, or have
-      // walked through a `yield` or passed control to a sub-Task.
-      // Regardless, if we still own `gCurrentTask`, reset it. If we
-      // have not finished execution of this Task, re-entering `_run`
-      // will set `gCurrentTask` to `this` as needed.
-      //
-      // We just need to be careful here in case we hit the following
-      // pattern:
-      //
-      //   Task.spawn(foo);
-      //   Task.spawn(bar);
-      //
-      // Here, `foo` and `bar` may be interleaved, so when we finish
-      // executing `foo`, `gCurrentTask` may actually either `foo` or
-      // `bar`. If `gCurrentTask` has already been set to `bar`, leave
-      // it be and it will be reset to `null` once `bar` is complete.
-      //
-      if (gCurrentTask == this) {
-        gCurrentTask = null;
-      }
-    }
-  },
-
-  /**
-   * Handle a value yielded by a generator.
-   *
-   * @param value
-   *        The yielded value to handle.
-   */
-  _handleResultValue: function (value) {
-    // If our task yielded an iterator resulting from calling another
-    // generator function, automatically spawn a task from it, effectively
-    // turning it into a promise that is fulfilled on task completion.
-    if (isGenerator(value)) {
-      value = Task.spawn(value);
-    }
-
-    if (value && typeof (value.then) == "function") {
-      // We have a promise object now. When fulfilled, call again into this
-      // function to continue the task, with either a resolution or rejection
-      // condition.
-      value.then(this._run.bind(this, true),
-                  this._run.bind(this, false));
-    } else {
-      // If our task yielded a value that is not a promise, just continue and
-      // pass it directly as the result of the yield statement.
-      this._run(true, value);
-    }
-  },
-
-  /**
-   * Handle an uncaught exception thrown from a generator.
-   *
-   * @param exception
-   *        The uncaught exception to handle.
-   */
-  _handleException: function (exception) {
-    gCurrentTask = this;
-
-    if (exception && typeof exception == "object" && "stack" in exception) {
-      let stack = exception.stack;
-
-      if (gMaintainStack &&
-          exception._capturedTaskStack != this._stack &&
-          typeof stack == "string") {
-        // Rewrite the stack for more readability.
-
-        let bottomStack = this._stack;
-
-        stack = Task.Debugging.generateReadableStack(stack);
-
-        exception.stack = stack;
-
-        // If exception is reinjected in the same task and rethrown,
-        // we don't want to perform the rewrite again.
-        exception._capturedTaskStack = bottomStack;
-      } else if (!stack) {
-        stack = "Not available";
-      }
-
-      if ("name" in exception &&
-          ERRORS_TO_REPORT.indexOf(exception.name) != -1) {
-        // We suspect that the exception is a programmer error, so we now
-        // display it using dump().  Note that we do not use Cu.reportError as
-        // we assume that this is a programming error, so we do not want end
-        // users to see it. Also, if the programmer handles errors correctly,
-        // they will either treat the error or log them somewhere.
-
-        dump("*************************\n");
-        dump("A coding exception was thrown and uncaught in a Task.\n\n");
-        dump("Full message: " + exception + "\n");
-        dump("Full stack: " + exception.stack + "\n");
-        dump("*************************\n");
-      }
-    }
-
-    this.deferred.reject(exception);
-  },
-
-  get callerStack() {
-    // Cut `this._stack` at the last line of the first block that
-    // contains task.js, keep the tail.
-    for (let [line, index] of linesOf(this._stack || "")) {
-      if (line.indexOf("/task.js:") == -1) {
-        return this._stack.substring(index);
-      }
-    }
-    return "";
-  }
-};
-
-Task.Debugging = {
-
-  /**
-   * Control stack rewriting.
-   *
-   * If `true`, any exception thrown from a Task will be rewritten to
-   * provide a human-readable stack trace. Otherwise, stack traces will
-   * be left unchanged.
-   *
-   * There is a (small but existing) runtime cost associated to stack
-   * rewriting, so you should probably not activate this in production
-   * code.
-   *
-   * @type {bool}
-   */
-  get maintainStack() {
-    return gMaintainStack;
-  },
-  set maintainStack(x) {
-    if (!x) {
-      gCurrentTask = null;
-    }
-    gMaintainStack = x;
-    return x;
-  },
-
-  /**
-   * Generate a human-readable stack for an error raised in
-   * a Task.
-   *
-   * @param {string} topStack The stack provided by the error.
-   * @param {string=} prefix Optionally, a prefix for each line.
-   */
-  generateReadableStack: function (topStack, prefix = "") {
-    if (!gCurrentTask) {
-      return topStack;
-    }
-
-    // Cut `topStack` at the first line that contains task.js, keep the head.
-    let lines = [];
-    for (let [line] of linesOf(topStack)) {
-      if (line.indexOf("/task.js:") != -1) {
-        break;
-      }
-      lines.push(prefix + line);
-    }
-    if (!prefix) {
-      lines.push(gCurrentTask.callerStack);
-    } else {
-      for (let [line] of linesOf(gCurrentTask.callerStack)) {
-        lines.push(prefix + line);
-      }
-    }
-
-    return lines.join("\n");
-  }
-};
-
-exports.Task = Task;

deleted file mode 100644
--- a/devtools/client/debugger/packages/devtools-modules/src/utils/telemetry.js
+++ /dev/null
@@ -1,331 +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/>. */
-
-/**
- * This is a stub of the DevTools telemetry module and will be replaced by the
- * full version of the file by Webpack for running inside Firefox.
- */
-
-class Telemetry {
-  /**
-   * Time since the system wide epoch. This is not a monotonic timer but
-   * can be used across process boundaries.
-   */
-  get msSystemNow() {
-    return 0;
-  }
-
-  /**
-   * Starts a timer associated with a telemetry histogram. The timer can be
-   * directly associated with a histogram, or with a pair of a histogram and
-   * an object.
-   *
-   * @param {String} histogramId
-   *        A string which must be a valid histogram name.
-   * @param {Object} obj
-   *        Optional parameter. If specified, the timer is associated with this
-   *        object, meaning that multiple timers for the same histogram may be
-   *        run concurrently, as long as they are associated with different
-   *        objects.
-   *
-   * @returns {Boolean}
-   *          True if the timer was successfully started, false otherwise. If a
-   *          timer already exists, it can't be started again, and the existing
-   *          one will be cleared in order to avoid measurements errors.
-   */
-  start(histogramId, obj) {
-    return true;
-  }
-
-  /**
-   * Starts a timer associated with a keyed telemetry histogram. The timer can
-   * be directly associated with a histogram and its key. Similarly to
-   * TelemetryStopwatch.start the histogram and its key can be associated
-   * with an object. Each key may have multiple associated objects and each
-   * object can be associated with multiple keys.
-   *
-   * @param {String} histogramId
-   *        A string which must be a valid histogram name.
-   * @param {String} key
-   *        A string which must be a valid histgram key.
-   * @param {Object} obj
-   *        Optional parameter. If specified, the timer is associated with this
-   *        object, meaning that multiple timers for the same histogram may be
-   *        run concurrently,as long as they are associated with different
-   *        objects.
-   *
-   * @returns {Boolean}
-   *          True if the timer was successfully started, false otherwise. If a
-   *          timer already exists, it can't be started again, and the existing
-   *          one will be cleared in order to avoid measurements errors.
-   */
-  startKeyed(histogramId, key, obj) {
-    return true;
-  }
-
-  /**
-   * Stops the timer associated with the given histogram (and object),
-   * calculates the time delta between start and finish, and adds the value
-   * to the histogram.
-   *
-   * @param {String} histogramId
-   *        A string which must be a valid histogram name.
-   * @param {Object} obj
-   *        Optional parameter which associates the histogram timer with the
-   *        given object.
-   * @param {Boolean} canceledOkay
-   *        Optional parameter which will suppress any warnings that normally
-   *        fire when a stopwatch is finished after being cancelled.
-   *        Defaults to false.
-   *
-   * @returns {Boolean}
-   *          True if the timer was succesfully stopped and the data was added
-   *          to the histogram, False otherwise.
-   */
-  finish(histogramId, obj, canceledOkay) {
-    return true;
-  }
-
-  /**
-   * Stops the timer associated with the given keyed histogram (and object),
-   * calculates the time delta between start and finish, and adds the value
-   * to the keyed histogram.
-   *
-   * @param {String} histogramId
-   *        A string which must be a valid histogram name.
-   * @param {String} key
-   *        A string which must be a valid histogram key.
-   * @param {Object} obj
-   *        Optional parameter which associates the histogram timer with the
-   *        given object.
-   * @param {Boolean} canceledOkay
-   *        Optional parameter which will suppress any warnings that normally
-   *        fire when a stopwatch is finished after being cancelled.
-   *        Defaults to false.
-   *
-   * @returns {Boolean}
-   *          True if the timer was succesfully stopped and the data was added
-   *          to the histogram, False otherwise.
-   */
-  finishKeyed(histogramId, key, obj, cancelledOkay) {
-    return true;
-  }
-
-  /**
-   * Log a value to a histogram.
-   *
-   * @param  {String} histogramId
-   *         Histogram in which the data is to be stored.
-   */
-  getHistogramById(histogramId) {
-    return {
-      add: () => {}
-    };
-  }
-
-  /**
-   * Get a keyed histogram.
-   *
-   * @param  {String} histogramId
-   *         Histogram in which the data is to be stored.
-   */
-  getKeyedHistogramById(histogramId) {
-    return {
-      add: () => {}
-    };
-  }
-
-  /**
-   * Log a value to a scalar.
-   *
-   * @param  {String} scalarId
-   *         Scalar in which the data is to be stored.
-   * @param  value
-   *         Value to store.
-   */
-  scalarSet(scalarId, value) {}
-
-  /**
-   * Log a value to a count scalar.
-   *
-   * @param  {String} scalarId
-   *         Scalar in which the data is to be stored.
-   * @param  value
-   *         Value to store.
-   */
-  scalarAdd(scalarId, value) {}
-
-  /**
-   * Log a value to a keyed count scalar.
-   *
-   * @param  {String} scalarId
-   *         Scalar in which the data is to be stored.
-   * @param  {String} key
-   *         The key within the  scalar.
-   * @param  value
-   *         Value to store.
-   */
-  keyedScalarAdd(scalarId, key, value) {}
-
-  /**
-   * Event telemetry is disabled by default. Use this method to enable it for
-   * a particular category.
-   *
-   * @param {Boolean} enabled
-   *        Enabled: true or false.
-   */
-  setEventRecordingEnabled(enabled) {
-    return enabled;
-  }
-
-  /**
-   * Telemetry events often need to make use of a number of properties from
-   * completely different codepaths. To make this possible we create a
-   * "pending event" along with an array of property names that we need to wait
-   * for before sending the event.
-   *
-   * As each property is received via addEventProperty() we check if all
-   * properties have been received. Once they have all been received we send the
-   * telemetry event.
-   *
-   * @param {Object} obj
-   *        The telemetry event or ping is associated with this object, meaning
-   *        that multiple events or pings for the same histogram may be run
-   *        concurrently, as long as they are associated with different objects.
-   * @param {String} method
-   *        The telemetry event method (describes the type of event that
-   *        occurred e.g. "open")
-   * @param {String} object
-   *        The telemetry event object name (the name of the object the event
-   *        occurred on) e.g. "tools" or "setting"
-   * @param {String|null} value
-   *        The telemetry event value (a user defined value, providing context
-   *        for the event) e.g. "console"
-   * @param {Array} expected
-   *        An array of the properties needed before sending the telemetry
-   *        event e.g.
-   *        [
-   *          "host",
-   *          "width"
-   *        ]
-   */
-  preparePendingEvent(obj, method, object, value, expected = []) {}
-
-  /**
-   * Adds an expected property for either a current or future pending event.
-   * This means that if preparePendingEvent() is called before or after sending
-   * the event properties they will automatically added to the event.
-   *
-   * @param {Object} obj
-   *        The telemetry event or ping is associated with this object, meaning
-   *        that multiple events or pings for the same histogram may be run
-   *        concurrently, as long as they are associated with different objects.
-   * @param {String} method
-   *        The telemetry event method (describes the type of event that
-   *        occurred e.g. "open")
-   * @param {String} object
-   *        The telemetry event object name (the name of the object the event
-   *        occurred on) e.g. "tools" or "setting"
-   * @param {String|null} value
-   *        The telemetry event value (a user defined value, providing context
-   *        for the event) e.g. "console"
-   * @param {String} pendingPropName
-   *        The pending property name
-   * @param {String} pendingPropValue
-   *        The pending property value
-   */
-  addEventProperty(obj, method, object, value, pendingPropName, pendingPropValue) {}
-
-  /**
-   * Adds expected properties for either a current or future pending event.
-   * This means that if preparePendingEvent() is called before or after sending
-   * the event properties they will automatically added to the event.
-   *
-   * @param {Object} obj
-   *        The telemetry event or ping is associated with this object, meaning
-   *        that multiple events or pings for the same histogram may be run
-   *        concurrently, as long as they are associated with different objects.
-   * @param {String} method
-   *        The telemetry event method (describes the type of event that
-   *        occurred e.g. "open")
-   * @param {String} object
-   *        The telemetry event object name (the name of the object the event
-   *        occurred on) e.g. "tools" or "setting"
-   * @param {String|null} value
-   *        The telemetry event value (a user defined value, providing context
-   *        for the event) e.g. "console"
-   * @param {String} pendingObject
-   *        An object containing key, value pairs that should be added to the
-   *        event as properties.
-   */
-  addEventProperties(obj, method, object, value, pendingObject) {}
-
-  /**
-   * A private method that is not to be used externally. This method is used to
-   * prepare a pending telemetry event for sending and then send it via
-   * recordEvent().
-   *
-   * @param {Object} obj
-   *        The telemetry event or ping is associated with this object, meaning
-   *        that multiple events or pings for the same histogram may be run
-   *        concurrently, as long as they are associated with different objects.
-   * @param {String} method
-   *        The telemetry event method (describes the type of event that
-   *        occurred e.g. "open")
-   * @param {String} object
-   *        The telemetry event object name (the name of the object the event
-   *        occurred on) e.g. "tools" or "setting"
-   * @param {String|null} value
-   *        The telemetry event value (a user defined value, providing context
-   *        for the event) e.g. "console"
-   */
-  _sendPendingEvent(obj, method, object, value) {}
-
-  /**
-   * Send a telemetry event.
-   *
-   * @param {String} method
-   *        The telemetry event method (describes the type of event that
-   *        occurred e.g. "open")
-   * @param {String} object
-   *        The telemetry event object name (the name of the object the event
-   *        occurred on) e.g. "tools" or "setting"
-   * @param {String|null} value
-   *        The telemetry event value (a user defined value, providing context
-   *        for the event) e.g. "console"
-   * @param {Object} extra
-   *        The telemetry event extra object containing the properties that will
-   *        be sent with the event e.g.
-   *        {
-   *          host: "bottom",
-   *          width: "1024"
-   *        }
-   */
-  recordEvent(method, object, value, extra) {}
-
-  /**
-   * Sends telemetry pings to indicate that a tool has been opened.
-   *
-   * @param {String} id
-   *        The ID of the tool opened.
-   * @param {String} sessionId
-   *        Toolbox session id used when we need to ensure a tool really has a
-   *        timer before calculating a delta.
-   * @param {Object} obj
-   *        The telemetry event or ping is associated with this object, meaning
-   *        that multiple events or pings for the same histogram may be run
-   *        concurrently, as long as they are associated with different objects.
-   */
-  toolOpened(id, sessionId, obj) {}
-
-  /**
-   * Sends telemetry pings to indicate that a tool has been closed.
-   *
-   * @param {String} id
-   *        The ID of the tool opened.
-   */
-  toolClosed(id, sessionId, obj) {}
-}
-
-module.exports = Telemetry;