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diff --git a/dom/push/PushComponents.sys.mjs b/dom/push/PushComponents.sys.mjs
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+++ b/dom/push/PushComponents.sys.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This file exports XPCOM components for C++ and chrome JavaScript callers to
+ * interact with the Push service.
+ */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+var isParent =
+  Services.appinfo.processType === Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+
+const lazy = {};
+
+// The default Push service implementation.
+XPCOMUtils.defineLazyGetter(lazy, "PushService", function () {
+  if (Services.prefs.getBoolPref("dom.push.enabled")) {
+    const { PushService } = ChromeUtils.importESModule(
+      "resource://gre/modules/PushService.sys.mjs"
+    );
+    PushService.init();
+    return PushService;
+  }
+
+  throw Components.Exception("", Cr.NS_ERROR_NOT_AVAILABLE);
+});
+
+// Observer notification topics for push messages and subscription status
+// changes. These are duplicated and used in `nsIPushNotifier`. They're exposed
+// on `nsIPushService` so that JS callers only need to import this service.
+const OBSERVER_TOPIC_PUSH = "push-message";
+const OBSERVER_TOPIC_SUBSCRIPTION_CHANGE = "push-subscription-change";
+const OBSERVER_TOPIC_SUBSCRIPTION_MODIFIED = "push-subscription-modified";
+
+/**
+ * `PushServiceBase`, `PushServiceParent`, and `PushServiceContent` collectively
+ * implement the `nsIPushService` interface. This interface provides calls
+ * similar to the Push DOM API, but does not require service workers.
+ *
+ * Push service methods may be called from the parent or content process. The
+ * parent process implementation loads `PushService.jsm` at app startup, and
+ * calls its methods directly. The content implementation forwards calls to
+ * the parent Push service via IPC.
+ *
+ * The implementations share a class and contract ID.
+ */
+function PushServiceBase() {
+  this.wrappedJSObject = this;
+  this._addListeners();
+}
+
+PushServiceBase.prototype = {
+  classID: Components.ID("{daaa8d73-677e-4233-8acd-2c404bd01658}"),
+  contractID: "@mozilla.org/push/Service;1",
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIObserver",
+    "nsISupportsWeakReference",
+    "nsIPushService",
+    "nsIPushQuotaManager",
+    "nsIPushErrorReporter",
+  ]),
+
+  pushTopic: OBSERVER_TOPIC_PUSH,
+  subscriptionChangeTopic: OBSERVER_TOPIC_SUBSCRIPTION_CHANGE,
+  subscriptionModifiedTopic: OBSERVER_TOPIC_SUBSCRIPTION_MODIFIED,
+
+  ensureReady() {},
+
+  _addListeners() {
+    for (let message of this._messages) {
+      this._mm.addMessageListener(message, this);
+    }
+  },
+
+  _isValidMessage(message) {
+    return this._messages.includes(message.name);
+  },
+
+  observe(subject, topic, data) {
+    if (topic === "android-push-service") {
+      // Load PushService immediately.
+      this.ensureReady();
+    }
+  },
+
+  _deliverSubscription(request, props) {
+    if (!props) {
+      request.onPushSubscription(Cr.NS_OK, null);
+      return;
+    }
+    request.onPushSubscription(Cr.NS_OK, new PushSubscription(props));
+  },
+
+  _deliverSubscriptionError(request, error) {
+    let result =
+      typeof error.result == "number" ? error.result : Cr.NS_ERROR_FAILURE;
+    request.onPushSubscription(result, null);
+  },
+};
+
+/**
+ * The parent process implementation of `nsIPushService`. This version loads
+ * `PushService.jsm` at startup and calls its methods directly. It also
+ * receives and responds to requests from the content process.
+ */
+let parentInstance;
+function PushServiceParent() {
+  if (parentInstance) {
+    return parentInstance;
+  }
+  parentInstance = this;
+
+  PushServiceBase.call(this);
+}
+
+PushServiceParent.prototype = Object.create(PushServiceBase.prototype);
+
+XPCOMUtils.defineLazyServiceGetter(
+  PushServiceParent.prototype,
+  "_mm",
+  "@mozilla.org/parentprocessmessagemanager;1",
+  "nsISupports"
+);
+
+Object.assign(PushServiceParent.prototype, {
+  _messages: [
+    "Push:Register",
+    "Push:Registration",
+    "Push:Unregister",
+    "Push:Clear",
+    "Push:NotificationForOriginShown",
+    "Push:NotificationForOriginClosed",
+    "Push:ReportError",
+  ],
+
+  // nsIPushService methods
+
+  subscribe(scope, principal, callback) {
+    this.subscribeWithKey(scope, principal, [], callback);
+  },
+
+  subscribeWithKey(scope, principal, key, callback) {
+    this._handleRequest("Push:Register", principal, {
+      scope,
+      appServerKey: key,
+    })
+      .then(
+        result => {
+          this._deliverSubscription(callback, result);
+        },
+        error => {
+          this._deliverSubscriptionError(callback, error);
+        }
+      )
+      .catch(console.error);
+  },
+
+  unsubscribe(scope, principal, callback) {
+    this._handleRequest("Push:Unregister", principal, {
+      scope,
+    })
+      .then(
+        result => {
+          callback.onUnsubscribe(Cr.NS_OK, result);
+        },
+        error => {
+          callback.onUnsubscribe(Cr.NS_ERROR_FAILURE, false);
+        }
+      )
+      .catch(console.error);
+  },
+
+  getSubscription(scope, principal, callback) {
+    return this._handleRequest("Push:Registration", principal, {
+      scope,
+    })
+      .then(
+        result => {
+          this._deliverSubscription(callback, result);
+        },
+        error => {
+          this._deliverSubscriptionError(callback, error);
+        }
+      )
+      .catch(console.error);
+  },
+
+  clearForDomain(domain, callback) {
+    return this._handleRequest("Push:Clear", null, {
+      domain,
+    })
+      .then(
+        result => {
+          callback.onClear(Cr.NS_OK);
+        },
+        error => {
+          callback.onClear(Cr.NS_ERROR_FAILURE);
+        }
+      )
+      .catch(console.error);
+  },
+
+  // nsIPushQuotaManager methods
+
+  notificationForOriginShown(origin) {
+    this.service.notificationForOriginShown(origin);
+  },
+
+  notificationForOriginClosed(origin) {
+    this.service.notificationForOriginClosed(origin);
+  },
+
+  // nsIPushErrorReporter methods
+
+  reportDeliveryError(messageId, reason) {
+    this.service.reportDeliveryError(messageId, reason);
+  },
+
+  receiveMessage(message) {
+    if (!this._isValidMessage(message)) {
+      return;
+    }
+    let { name, target, data } = message;
+    if (name === "Push:NotificationForOriginShown") {
+      this.notificationForOriginShown(data);
+      return;
+    }
+    if (name === "Push:NotificationForOriginClosed") {
+      this.notificationForOriginClosed(data);
+      return;
+    }
+    if (name === "Push:ReportError") {
+      this.reportDeliveryError(data.messageId, data.reason);
+      return;
+    }
+    this._handleRequest(name, data.principal, data)
+      .then(
+        result => {
+          target.sendAsyncMessage(this._getResponseName(name, "OK"), {
+            requestID: data.requestID,
+            result,
+          });
+        },
+        error => {
+          target.sendAsyncMessage(this._getResponseName(name, "KO"), {
+            requestID: data.requestID,
+            result: error.result,
+          });
+        }
+      )
+      .catch(console.error);
+  },
+
+  ensureReady() {
+    this.service.init();
+  },
+
+  _toPageRecord(principal, data) {
+    if (!data.scope) {
+      throw new Error("Invalid page record: missing scope");
+    }
+    if (!principal) {
+      throw new Error("Invalid page record: missing principal");
+    }
+    if (principal.isNullPrincipal || principal.isExpandedPrincipal) {
+      throw new Error("Invalid page record: unsupported principal");
+    }
+
+    // System subscriptions can only be created by chrome callers, and are
+    // exempt from the background message quota and permission checks. They
+    // also do not fire service worker events.
+    data.systemRecord = principal.isSystemPrincipal;
+
+    data.originAttributes = ChromeUtils.originAttributesToSuffix(
+      principal.originAttributes
+    );
+
+    return data;
+  },
+
+  async _handleRequest(name, principal, data) {
+    if (name == "Push:Clear") {
+      return this.service.clear(data);
+    }
+
+    let pageRecord;
+    try {
+      pageRecord = this._toPageRecord(principal, data);
+    } catch (e) {
+      return Promise.reject(e);
+    }
+
+    if (name === "Push:Register") {
+      return this.service.register(pageRecord);
+    }
+    if (name === "Push:Registration") {
+      return this.service.registration(pageRecord);
+    }
+    if (name === "Push:Unregister") {
+      return this.service.unregister(pageRecord);
+    }
+
+    return Promise.reject(new Error("Invalid request: unknown name"));
+  },
+
+  _getResponseName(requestName, suffix) {
+    let name = requestName.slice("Push:".length);
+    return "PushService:" + name + ":" + suffix;
+  },
+
+  // Methods used for mocking in tests.
+
+  replaceServiceBackend(options) {
+    return this.service.changeTestServer(options.serverURI, options);
+  },
+
+  restoreServiceBackend() {
+    var defaultServerURL = Services.prefs.getCharPref("dom.push.serverURL");
+    return this.service.changeTestServer(defaultServerURL);
+  },
+});
+
+// Used to replace the implementation with a mock.
+Object.defineProperty(PushServiceParent.prototype, "service", {
+  get() {
+    return this._service || lazy.PushService;
+  },
+  set(impl) {
+    this._service = impl;
+  },
+});
+
+let contentInstance;
+/**
+ * The content process implementation of `nsIPushService`. This version
+ * uses the child message manager to forward calls to the parent process.
+ * The parent Push service instance handles the request, and responds with a
+ * message containing the result.
+ */
+function PushServiceContent() {
+  if (contentInstance) {
+    return contentInstance;
+  }
+  contentInstance = this;
+
+  PushServiceBase.apply(this, arguments);
+  this._requests = new Map();
+  this._requestId = 0;
+}
+
+PushServiceContent.prototype = Object.create(PushServiceBase.prototype);
+
+XPCOMUtils.defineLazyServiceGetter(
+  PushServiceContent.prototype,
+  "_mm",
+  "@mozilla.org/childprocessmessagemanager;1",
+  "nsISupports"
+);
+
+Object.assign(PushServiceContent.prototype, {
+  _messages: [
+    "PushService:Register:OK",
+    "PushService:Register:KO",
+    "PushService:Registration:OK",
+    "PushService:Registration:KO",
+    "PushService:Unregister:OK",
+    "PushService:Unregister:KO",
+    "PushService:Clear:OK",
+    "PushService:Clear:KO",
+  ],
+
+  // nsIPushService methods
+
+  subscribe(scope, principal, callback) {
+    this.subscribeWithKey(scope, principal, [], callback);
+  },
+
+  subscribeWithKey(scope, principal, key, callback) {
+    let requestID = this._addRequest(callback);
+    this._mm.sendAsyncMessage("Push:Register", {
+      scope,
+      appServerKey: key,
+      requestID,
+      principal,
+    });
+  },
+
+  unsubscribe(scope, principal, callback) {
+    let requestID = this._addRequest(callback);
+    this._mm.sendAsyncMessage("Push:Unregister", {
+      scope,
+      requestID,
+      principal,
+    });
+  },
+
+  getSubscription(scope, principal, callback) {
+    let requestID = this._addRequest(callback);
+    this._mm.sendAsyncMessage("Push:Registration", {
+      scope,
+      requestID,
+      principal,
+    });
+  },
+
+  clearForDomain(domain, callback) {
+    let requestID = this._addRequest(callback);
+    this._mm.sendAsyncMessage("Push:Clear", {
+      domain,
+      requestID,
+    });
+  },
+
+  // nsIPushQuotaManager methods
+
+  notificationForOriginShown(origin) {
+    this._mm.sendAsyncMessage("Push:NotificationForOriginShown", origin);
+  },
+
+  notificationForOriginClosed(origin) {
+    this._mm.sendAsyncMessage("Push:NotificationForOriginClosed", origin);
+  },
+
+  // nsIPushErrorReporter methods
+
+  reportDeliveryError(messageId, reason) {
+    this._mm.sendAsyncMessage("Push:ReportError", {
+      messageId,
+      reason,
+    });
+  },
+
+  _addRequest(data) {
+    let id = ++this._requestId;
+    this._requests.set(id, data);
+    return id;
+  },
+
+  _takeRequest(requestId) {
+    let d = this._requests.get(requestId);
+    this._requests.delete(requestId);
+    return d;
+  },
+
+  receiveMessage(message) {
+    if (!this._isValidMessage(message)) {
+      return;
+    }
+    let { name, data } = message;
+    let request = this._takeRequest(data.requestID);
+
+    if (!request) {
+      return;
+    }
+
+    switch (name) {
+      case "PushService:Register:OK":
+      case "PushService:Registration:OK":
+        this._deliverSubscription(request, data.result);
+        break;
+
+      case "PushService:Register:KO":
+      case "PushService:Registration:KO":
+        this._deliverSubscriptionError(request, data);
+        break;
+
+      case "PushService:Unregister:OK":
+        if (typeof data.result === "boolean") {
+          request.onUnsubscribe(Cr.NS_OK, data.result);
+        } else {
+          request.onUnsubscribe(Cr.NS_ERROR_FAILURE, false);
+        }
+        break;
+
+      case "PushService:Unregister:KO":
+        request.onUnsubscribe(Cr.NS_ERROR_FAILURE, false);
+        break;
+
+      case "PushService:Clear:OK":
+        request.onClear(Cr.NS_OK);
+        break;
+
+      case "PushService:Clear:KO":
+        request.onClear(Cr.NS_ERROR_FAILURE);
+        break;
+
+      default:
+        break;
+    }
+  },
+});
+
+/** `PushSubscription` instances are passed to all subscription callbacks. */
+function PushSubscription(props) {
+  this._props = props;
+}
+
+PushSubscription.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsIPushSubscription"]),
+
+  /** The URL for sending messages to this subscription. */
+  get endpoint() {
+    return this._props.endpoint;
+  },
+
+  /** The last time a message was sent to this subscription. */
+  get lastPush() {
+    return this._props.lastPush;
+  },
+
+  /** The total number of messages sent to this subscription. */
+  get pushCount() {
+    return this._props.pushCount;
+  },
+
+  /** The number of remaining background messages that can be sent to this
+   * subscription, or -1 of the subscription is exempt from the quota.
+   */
+  get quota() {
+    return this._props.quota;
+  },
+
+  /**
+   * Indicates whether this subscription was created with the system principal.
+   * System subscriptions are exempt from the background message quota and
+   * permission checks.
+   */
+  get isSystemSubscription() {
+    return !!this._props.systemRecord;
+  },
+
+  /** The private key used to decrypt incoming push messages, in JWK format */
+  get p256dhPrivateKey() {
+    return this._props.p256dhPrivateKey;
+  },
+
+  /**
+   * Indicates whether this subscription is subject to the background message
+   * quota.
+   */
+  quotaApplies() {
+    return this.quota >= 0;
+  },
+
+  /**
+   * Indicates whether this subscription exceeded the background message quota,
+   * or the user revoked the notification permission. The caller must request a
+   * new subscription to continue receiving push messages.
+   */
+  isExpired() {
+    return this.quota === 0;
+  },
+
+  /**
+   * Returns a key for encrypting messages sent to this subscription. JS
+   * callers receive the key buffer as a return value, while C++ callers
+   * receive the key size and buffer as out parameters.
+   */
+  getKey(name) {
+    switch (name) {
+      case "p256dh":
+        return this._getRawKey(this._props.p256dhKey);
+
+      case "auth":
+        return this._getRawKey(this._props.authenticationSecret);
+
+      case "appServer":
+        return this._getRawKey(this._props.appServerKey);
+    }
+    return [];
+  },
+
+  _getRawKey(key) {
+    if (!key) {
+      return [];
+    }
+    return new Uint8Array(key);
+  },
+};
+
+// Export the correct implementation depending on whether we're running in
+// the parent or content process.
+export let Service = isParent ? PushServiceParent : PushServiceContent;