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diff --git a/devtools/client/shared/test-helpers/jest-fixtures/Services.js b/devtools/client/shared/test-helpers/jest-fixtures/Services.js
new file mode 100644
index 0000000000..5fde2e5d05
--- /dev/null
+++ b/devtools/client/shared/test-helpers/jest-fixtures/Services.js
@@ -0,0 +1,563 @@
+/* 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";
+
+/* globals localStorage, window */
+
+// XXX: This file is a copy of the Services shim from devtools-services.
+// See https://github.com/firefox-devtools/devtools-core/blob/a9263b4c3f88ea42879a36cdc3ca8217b4a528ea/packages/devtools-services/index.js
+// Many Jest tests in the debugger rely on preferences, but can't use Services.
+// This fixture is probably doing too much and should be reduced to the minimum
+// needed to pass the tests.
+
+/* eslint-disable mozilla/valid-services */
+
+// Some constants from nsIPrefBranch.idl.
+const PREF_INVALID = 0;
+const PREF_STRING = 32;
+const PREF_INT = 64;
+const PREF_BOOL = 128;
+const NS_PREFBRANCH_PREFCHANGE_TOPIC_ID = "nsPref:changed";
+
+// We prefix all our local storage items with this.
+const PREFIX = "Services.prefs:";
+
+/**
+ * Create a new preference branch.  This object conforms largely to
+ * nsIPrefBranch and nsIPrefService, though it only implements the
+ * subset needed by devtools.  A preference branch can hold child
+ * preferences while also holding a preference value itself.
+ *
+ * @param {PrefBranch} parent the parent branch, or null for the root
+ *        branch.
+ * @param {String} name the base name of this branch
+ * @param {String} fullName the fully-qualified name of this branch
+ */
+function PrefBranch(parent, name, fullName) {
+  this._parent = parent;
+  this._name = name;
+  this._fullName = fullName;
+  this._observers = {};
+  this._children = {};
+
+  // Properties used when this branch has a value as well.
+  this._defaultValue = null;
+  this._hasUserValue = false;
+  this._userValue = null;
+  this._type = PREF_INVALID;
+}
+
+PrefBranch.prototype = {
+  PREF_INVALID,
+  PREF_STRING,
+  PREF_INT,
+  PREF_BOOL,
+
+  /** @see nsIPrefBranch.root.  */
+  get root() {
+    return this._fullName;
+  },
+
+  /** @see nsIPrefBranch.getPrefType.  */
+  getPrefType(prefName) {
+    return this._findPref(prefName)._type;
+  },
+
+  /** @see nsIPrefBranch.getBoolPref.  */
+  getBoolPref(prefName, defaultValue) {
+    try {
+      const thePref = this._findPref(prefName);
+      if (thePref._type !== PREF_BOOL) {
+        throw new Error(`${prefName} does not have bool type`);
+      }
+      return thePref._get();
+    } catch (e) {
+      if (typeof defaultValue !== "undefined") {
+        return defaultValue;
+      }
+      throw e;
+    }
+  },
+
+  /** @see nsIPrefBranch.setBoolPref.  */
+  setBoolPref(prefName, value) {
+    if (typeof value !== "boolean") {
+      throw new Error("non-bool passed to setBoolPref");
+    }
+    const thePref = this._findOrCreatePref(prefName, value, true, value);
+    if (thePref._type !== PREF_BOOL) {
+      throw new Error(`${prefName} does not have bool type`);
+    }
+    thePref._set(value);
+  },
+
+  /** @see nsIPrefBranch.getCharPref.  */
+  getCharPref(prefName, defaultValue) {
+    try {
+      const thePref = this._findPref(prefName);
+      if (thePref._type !== PREF_STRING) {
+        throw new Error(`${prefName} does not have string type`);
+      }
+      return thePref._get();
+    } catch (e) {
+      if (typeof defaultValue !== "undefined") {
+        return defaultValue;
+      }
+      throw e;
+    }
+  },
+
+  /** @see nsIPrefBranch.getStringPref.  */
+  getStringPref() {
+    return this.getCharPref.apply(this, arguments);
+  },
+
+  /** @see nsIPrefBranch.setCharPref.  */
+  setCharPref(prefName, value) {
+    if (typeof value !== "string") {
+      throw new Error("non-string passed to setCharPref");
+    }
+    const thePref = this._findOrCreatePref(prefName, value, true, value);
+    if (thePref._type !== PREF_STRING) {
+      throw new Error(`${prefName} does not have string type`);
+    }
+    thePref._set(value);
+  },
+
+  /** @see nsIPrefBranch.setStringPref.  */
+  setStringPref() {
+    return this.setCharPref.apply(this, arguments);
+  },
+
+  /** @see nsIPrefBranch.getIntPref.  */
+  getIntPref(prefName, defaultValue) {
+    try {
+      const thePref = this._findPref(prefName);
+      if (thePref._type !== PREF_INT) {
+        throw new Error(`${prefName} does not have int type`);
+      }
+      return thePref._get();
+    } catch (e) {
+      if (typeof defaultValue !== "undefined") {
+        return defaultValue;
+      }
+      throw e;
+    }
+  },
+
+  /** @see nsIPrefBranch.setIntPref.  */
+  setIntPref(prefName, value) {
+    if (typeof value !== "number") {
+      throw new Error("non-number passed to setIntPref");
+    }
+    const thePref = this._findOrCreatePref(prefName, value, true, value);
+    if (thePref._type !== PREF_INT) {
+      throw new Error(`${prefName} does not have int type`);
+    }
+    thePref._set(value);
+  },
+
+  /** @see nsIPrefBranch.clearUserPref */
+  clearUserPref(prefName) {
+    const thePref = this._findPref(prefName);
+    thePref._clearUserValue();
+  },
+
+  /** @see nsIPrefBranch.prefHasUserValue */
+  prefHasUserValue(prefName) {
+    const thePref = this._findPref(prefName);
+    return thePref._hasUserValue;
+  },
+
+  /** @see nsIPrefBranch.addObserver */
+  addObserver(domain, observer, holdWeak) {
+    if (holdWeak) {
+      throw new Error("shim prefs only supports strong observers");
+    }
+
+    if (!(domain in this._observers)) {
+      this._observers[domain] = [];
+    }
+    this._observers[domain].push(observer);
+  },
+
+  /** @see nsIPrefBranch.removeObserver */
+  removeObserver(domain, observer) {
+    if (!(domain in this._observers)) {
+      return;
+    }
+    const index = this._observers[domain].indexOf(observer);
+    if (index >= 0) {
+      this._observers[domain].splice(index, 1);
+    }
+  },
+
+  /** @see nsIPrefService.savePrefFile */
+  savePrefFile(file) {
+    if (file) {
+      throw new Error("shim prefs only supports null file in savePrefFile");
+    }
+    // Nothing to do - this implementation always writes back.
+  },
+
+  /** @see nsIPrefService.getBranch */
+  getBranch(prefRoot) {
+    if (!prefRoot) {
+      return this;
+    }
+    if (prefRoot.endsWith(".")) {
+      prefRoot = prefRoot.slice(0, -1);
+    }
+    // This is a bit weird since it could erroneously return a pref,
+    // not a pref branch.
+    return this._findPref(prefRoot);
+  },
+
+  /**
+   * Return this preference's current value.
+   *
+   * @return {Any} The current value of this preference.  This may
+   *         return a string, a number, or a boolean depending on the
+   *         preference's type.
+   */
+  _get() {
+    if (this._hasUserValue) {
+      return this._userValue;
+    }
+    return this._defaultValue;
+  },
+
+  /**
+   * Set the preference's value.  The new value is assumed to be a
+   * user value.  After setting the value, this function emits a
+   * change notification.
+   *
+   * @param {Any} value the new value
+   */
+  _set(value) {
+    if (!this._hasUserValue || value !== this._userValue) {
+      this._userValue = value;
+      this._hasUserValue = true;
+      this._saveAndNotify();
+    }
+  },
+
+  /**
+   * Set the default value for this preference, and emit a
+   * notification if this results in a visible change.
+   *
+   * @param {Any} value the new default value
+   */
+  _setDefault(value) {
+    if (this._defaultValue !== value) {
+      this._defaultValue = value;
+      if (!this._hasUserValue) {
+        this._saveAndNotify();
+      }
+    }
+  },
+
+  /**
+   * If this preference has a user value, clear it.  If a change was
+   * made, emit a change notification.
+   */
+  _clearUserValue() {
+    if (this._hasUserValue) {
+      this._userValue = null;
+      this._hasUserValue = false;
+      this._saveAndNotify();
+    }
+  },
+
+  /**
+   * Helper function to write the preference's value to local storage
+   * and then emit a change notification.
+   */
+  _saveAndNotify() {
+    const store = {
+      type: this._type,
+      defaultValue: this._defaultValue,
+      hasUserValue: this._hasUserValue,
+      userValue: this._userValue,
+    };
+
+    localStorage.setItem(PREFIX + this._fullName, JSON.stringify(store));
+    this._parent._notify(this._name);
+  },
+
+  /**
+   * Change this preference's value without writing it back to local
+   * storage.  This is used to handle changes to local storage that
+   * were made externally.
+   *
+   * @param {Number} type one of the PREF_* values
+   * @param {Any} userValue the user value to use if the pref does not exist
+   * @param {Any} defaultValue the default value to use if the pref
+   *        does not exist
+   * @param {Boolean} hasUserValue if a new pref is created, whether
+   *        the default value is also a user value
+   * @param {Object} store the new value of the preference.  It should
+   *        be of the form {type, defaultValue, hasUserValue, userValue};
+   *        where |type| is one of the PREF_* type constants; |defaultValue|
+   *        and |userValue| are the default and user values, respectively;
+   *        and |hasUserValue| is a boolean indicating whether the user value
+   *        is valid
+   */
+  _storageUpdated(type, userValue, hasUserValue, defaultValue) {
+    this._type = type;
+    this._defaultValue = defaultValue;
+    this._hasUserValue = hasUserValue;
+    this._userValue = userValue;
+    // There's no need to write this back to local storage, since it
+    // came from there; and this avoids infinite event loops.
+    this._parent._notify(this._name);
+  },
+
+  /**
+   * Helper function to find either a Preference or PrefBranch object
+   * given its name.  If the name is not found, throws an exception.
+   *
+   * @param {String} prefName the fully-qualified preference name
+   * @return {Object} Either a Preference or PrefBranch object
+   */
+  _findPref(prefName) {
+    const branchNames = prefName.split(".");
+    let branch = this;
+
+    for (const branchName of branchNames) {
+      branch = branch._children[branchName];
+      if (!branch) {
+        // throw new Error(`could not find pref branch ${ prefName}`);
+        return false;
+      }
+    }
+
+    return branch;
+  },
+
+  /**
+   * Helper function to notify any observers when a preference has
+   * changed.  This will also notify the parent branch for further
+   * reporting.
+   *
+   * @param {String} relativeName the name of the updated pref,
+   *        relative to this branch
+   */
+  _notify(relativeName) {
+    for (const domain in this._observers) {
+      if (
+        relativeName === domain ||
+        domain === "" ||
+        (domain.endsWith(".") && relativeName.startsWith(domain))
+      ) {
+        // Allow mutation while walking.
+        const localList = this._observers[domain].slice();
+        for (const observer of localList) {
+          try {
+            if ("observe" in observer) {
+              observer.observe(
+                this,
+                NS_PREFBRANCH_PREFCHANGE_TOPIC_ID,
+                relativeName
+              );
+            } else {
+              // Function-style observer -- these aren't mentioned in
+              // the IDL, but they're accepted and devtools uses them.
+              observer(this, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, relativeName);
+            }
+          } catch (e) {
+            console.error(e);
+          }
+        }
+      }
+    }
+
+    if (this._parent) {
+      this._parent._notify(`${this._name}.${relativeName}`);
+    }
+  },
+
+  /**
+   * Helper function to create a branch given an array of branch names
+   * representing the path of the new branch.
+   *
+   * @param {Array} branchList an array of strings, one per component
+   *        of the branch to be created
+   * @return {PrefBranch} the new branch
+   */
+  _createBranch(branchList) {
+    let parent = this;
+    for (const branch of branchList) {
+      if (!parent._children[branch]) {
+        const isParentRoot = !parent._parent;
+        const branchName = (isParentRoot ? "" : `${parent.root}.`) + branch;
+        parent._children[branch] = new PrefBranch(parent, branch, branchName);
+      }
+      parent = parent._children[branch];
+    }
+    return parent;
+  },
+
+  /**
+   * Create a new preference.  The new preference is assumed to be in
+   * local storage already, and the new value is taken from there.
+   *
+   * @param {String} keyName the full-qualified name of the preference.
+   *        This is also the name of the key in local storage.
+   * @param {Any} userValue the user value to use if the pref does not exist
+   * @param {Boolean} hasUserValue if a new pref is created, whether
+   *        the default value is also a user value
+   * @param {Any} defaultValue the default value to use if the pref
+   *        does not exist
+   * @param {Boolean} init if true, then this call is initialization
+   *        from local storage and should override the default prefs
+   */
+  _findOrCreatePref(
+    keyName,
+    userValue,
+    hasUserValue,
+    defaultValue,
+    init = false
+  ) {
+    const branch = this._createBranch(keyName.split("."));
+
+    if (hasUserValue && typeof userValue !== typeof defaultValue) {
+      throw new Error(`inconsistent values when creating ${keyName}`);
+    }
+
+    let type;
+    switch (typeof defaultValue) {
+      case "boolean":
+        type = PREF_BOOL;
+        break;
+      case "number":
+        type = PREF_INT;
+        break;
+      case "string":
+        type = PREF_STRING;
+        break;
+      default:
+        throw new Error(`unhandled argument type: ${typeof defaultValue}`);
+    }
+
+    if (init || branch._type === PREF_INVALID) {
+      branch._storageUpdated(type, userValue, hasUserValue, defaultValue);
+    } else if (branch._type !== type) {
+      throw new Error(`attempt to change type of pref ${keyName}`);
+    }
+
+    return branch;
+  },
+
+  getKeyName(keyName) {
+    if (keyName.startsWith(PREFIX)) {
+      return keyName.slice(PREFIX.length);
+    }
+
+    return keyName;
+  },
+
+  /**
+   * Helper function that is called when local storage changes.  This
+   * updates the preferences and notifies pref observers as needed.
+   *
+   * @param {StorageEvent} event the event representing the local
+   *        storage change
+   */
+  _onStorageChange(event) {
+    if (event.storageArea !== localStorage) {
+      return;
+    }
+
+    const key = this.getKeyName(event.key);
+
+    // Ignore delete events.  Not clear what's correct.
+    if (key === null || event.newValue === null) {
+      return;
+    }
+
+    const { type, userValue, hasUserValue, defaultValue } = JSON.parse(
+      event.newValue
+    );
+    if (event.oldValue === null) {
+      this._findOrCreatePref(key, userValue, hasUserValue, defaultValue);
+    } else {
+      const thePref = this._findPref(key);
+      thePref._storageUpdated(type, userValue, hasUserValue, defaultValue);
+    }
+  },
+
+  /**
+   * Helper function to initialize the root PrefBranch.
+   */
+  _initializeRoot() {
+    if (Services._defaultPrefsEnabled) {
+      /* eslint-disable no-eval */
+      // let devtools = require("raw!prefs!devtools/client/preferences/devtools");
+      // eval(devtools);
+      // let all = require("raw!prefs!modules/libpref/init/all");
+      // eval(all);
+      /* eslint-enable no-eval */
+    }
+
+    // Read the prefs from local storage and create the local
+    // representations.
+    for (let i = 0; i < localStorage.length; ++i) {
+      const keyName = localStorage.key(i);
+      if (keyName.startsWith(PREFIX)) {
+        const { userValue, hasUserValue, defaultValue } = JSON.parse(
+          localStorage.getItem(keyName)
+        );
+        this._findOrCreatePref(
+          keyName.slice(PREFIX.length),
+          userValue,
+          hasUserValue,
+          defaultValue,
+          true
+        );
+      }
+    }
+
+    this._onStorageChange = this._onStorageChange.bind(this);
+    window.addEventListener("storage", this._onStorageChange);
+  },
+};
+
+const Services = {
+  _prefs: null,
+
+  _defaultPrefsEnabled: true,
+
+  get prefs() {
+    if (!this._prefs) {
+      this._prefs = new PrefBranch(null, "", "");
+      this._prefs._initializeRoot();
+    }
+    return this._prefs;
+  },
+
+  appinfo: "",
+  obs: { addObserver: () => {} },
+  strings: {
+    createBundle(bundle) {
+      return {
+        GetStringFromName(str) {
+          return "NodeTest";
+        },
+      };
+    },
+  },
+};
+
+function pref(name, value) {
+  // eslint-disable-next-line mozilla/valid-services-property
+  const thePref = Services.prefs._findOrCreatePref(name, value, true, value);
+  thePref._setDefault(value);
+}
+
+module.exports = Services;
+Services.pref = pref;
+Services.uuid = { generateUUID: () => {} };
+Services.dns = {};