diff --git a/addons/mail_bot/static/src/js/mailbot_service.js b/addons/mail_bot/static/src/js/mailbot_service.js
index a75780ab090..d27487305ae 100644
--- a/addons/mail_bot/static/src/js/mailbot_service.js
+++ b/addons/mail_bot/static/src/js/mailbot_service.js
@@ -12,17 +12,16 @@ var MailBotService =  AbstractService.extend({
      * @override
      */
     start: function () {
-        var self = this;
+        this._hasRequest = (window.Notification && window.Notification.permission === "default") || false;
         if ('odoobot_initialized' in session && ! session.odoobot_initialized) {
-            setTimeout(function () {
-                session.odoobot_initialized = true;
-                self._rpc({
-                    model: 'mail.channel',
-                    method: 'init_odoobot',
-                });
-            }, 2*60*1000);
+            this._showOdoobotTimeout();
         }
     },
+
+    //--------------------------------------------------------------------------
+    // Public
+    //--------------------------------------------------------------------------
+
     /**
      * Get the previews related to the OdooBot (conversation not included).
      * For instance, when there is no conversation with OdooBot and OdooBot has
@@ -52,7 +51,31 @@ var MailBotService =  AbstractService.extend({
      * @returns {boolean}
      */
     hasRequest: function () {
-        return window.Notification && window.Notification.permission === "default";
+        return this._hasRequest;
+    },
+    /**
+     * Called when user either accepts or refuses push notifications.
+     */
+    removeRequest: function () {
+        this._hasRequest = false;
+    },
+
+    //--------------------------------------------------------------------------
+    // Private
+    //--------------------------------------------------------------------------
+
+    /**
+     * @private
+     */
+    _showOdoobotTimeout: function () {
+        var self = this;
+        setTimeout(function () {
+            session.odoobot_initialized = true;
+            self._rpc({
+                model: 'mail.channel',
+                method: 'init_odoobot',
+            });
+        }, 2*60*1000);
     },
 });
 
diff --git a/addons/mail_bot/static/src/js/systray_messaging_menu.js b/addons/mail_bot/static/src/js/systray_messaging_menu.js
index 05c0ee54f24..2ef1fc56d93 100644
--- a/addons/mail_bot/static/src/js/systray_messaging_menu.js
+++ b/addons/mail_bot/static/src/js/systray_messaging_menu.js
@@ -56,6 +56,7 @@ return MessagingMenu.include({
      * @param {string} value
      */
     _handleResponseNotificationPermission: function (value) {
+        this.call('mailbot_service', 'removeRequest');
         if (value !== 'granted') {
             this.call('bus_service', 'sendNotification', _t('Permission denied'),
                 _t('Odoo will not have the permission to send native notifications on this device.'));
diff --git a/addons/mail_bot/static/tests/systray_messaging_menu_tests.js b/addons/mail_bot/static/tests/systray_messaging_menu_tests.js
index a04aba7056a..f4edc452aa0 100644
--- a/addons/mail_bot/static/tests/systray_messaging_menu_tests.js
+++ b/addons/mail_bot/static/tests/systray_messaging_menu_tests.js
@@ -24,31 +24,44 @@ QUnit.module('MessagingMenu', {
             },
         };
 
-        // Patch mailbot_service so that it does do not do any RPC, and
-        // the detection of push notifications permissions can be simulated in
-        // the test cases. By default, shows 'OdooBot has a request'
+        this.services = _.extend({}, mailTestUtils.getMailServices(), {
+            mailbot_service: MailBotService
+        });
+
+        // By default, permission are to ask user for push notification ("default").
+        // Use requestPermissionDef to simulate permission change, e.g. "granted"
+        this.requestPermissionDef = $.Deferred();
+        this.ORIGINAL_WINDOW_NOTIFICATION = window.Notification;
+        window.Notification = {
+            permission: "default",
+            requestPermission: function () {
+                return self.requestPermissionDef;
+            },
+        };
+
+        // Patch mailbot_service so that it does do not do any RPC
         this.hasMailbotRequest = true;
         testUtils.patch(MailBotService, {
             /**
              * @override
              */
-            start: function () {},
-            /**
-             * @override
-             * @returns {boolean}
-             */
-            hasRequest: function () {
-                return self.hasMailbotRequest;
-            },
+            _showOdoobotTimeout: function () {},
         });
 
-        this.services = _.extend({}, mailTestUtils.getMailServices(), {
-            mailbot_service: MailBotService
+        // Patch Bus Service so that it does not play any audio (may raise
+        // Uncaught rejected Promise due to Chrome autoplay policy: https://goo.gl/xX8pDD)
+        testUtils.patch(this.services.bus_service, {
+            /**
+             * @override
+             */
+            _beep: function () {},
         });
     },
     afterEach: function () {
-        // unpatch MailBotService
+        // unpatch MailBotService and BusService
         testUtils.unpatch(MailBotService);
+        testUtils.unpatch(this.services.bus_service);
+        window.Notification = this.ORIGINAL_WINDOW_NOTIFICATION;
     }
 });
 
@@ -62,13 +75,13 @@ QUnit.test('messaging menu widget: rendering with OdooBot has a request', functi
     });
     messagingMenu.appendTo($('#qunit-fixture'));
 
-    assert.strictEqual(messagingMenu.$('.o_notification_counter').length, 1,
+    assert.containsOnce(messagingMenu, '.o_notification_counter',
         "should display a notification counter next to the messaging menu");
     assert.strictEqual(messagingMenu.$('.o_notification_counter').text(), '1',
         "should display a counter of '1' next to the messaging menu");
 
-    messagingMenu.$('.dropdown-toggle').click();
-    assert.strictEqual(messagingMenu.$('.o_preview_info').length, 1,
+    testUtils.dom.click(messagingMenu.$('.dropdown-toggle'));
+    assert.containsOnce(messagingMenu, '.o_preview_info',
         "should display a preview in the messaging menu");
     assert.strictEqual(messagingMenu.$('.o_preview_name').text().trim(),
         'OdooBot has a request',
@@ -79,10 +92,10 @@ QUnit.test('messaging menu widget: rendering with OdooBot has a request', functi
     messagingMenu.destroy();
 });
 
-QUnit.test('messaging menu widget: rendering without OdooBot has a request', function (assert) {
+QUnit.test('messaging menu widget: rendering without OdooBot has a request (denied)', function (assert) {
     assert.expect(3);
 
-    this.hasMailbotRequest = false;
+    window.Notification.permission = 'denied';
 
     var messagingMenu = new MessagingMenu();
     testUtils.addMockEnvironment(messagingMenu, {
@@ -91,12 +104,66 @@ QUnit.test('messaging menu widget: rendering without OdooBot has a request', fun
     });
     messagingMenu.appendTo($('#qunit-fixture'));
 
-    assert.strictEqual(messagingMenu.$('.o_notification_counter').length, 1,
+    assert.containsOnce(messagingMenu, '.o_notification_counter',
         "should display a notification counter next to the messaging menu");
     assert.strictEqual(messagingMenu.$('.o_notification_counter').text(), '0',
         "should display a counter of '0' next to the messaging menu");
-    messagingMenu.$('.dropdown-toggle').click();
-    assert.strictEqual(messagingMenu.$('.o_preview_info').length, 0,
+    testUtils.dom.click(messagingMenu.$('.dropdown-toggle'));
+    assert.containsNone(messagingMenu, '.o_preview_info',
+        "should display no preview in the messaging menu");
+
+    messagingMenu.destroy();
+});
+
+QUnit.test('messaging menu widget: rendering without OdooBot has a request (accepted)', function (assert) {
+    assert.expect(3);
+
+    window.Notification.permission = 'granted';
+
+    var messagingMenu = new MessagingMenu();
+    testUtils.addMockEnvironment(messagingMenu, {
+        data: this.data,
+        services: this.services,
+    });
+    messagingMenu.appendTo($('#qunit-fixture'));
+
+    assert.containsOnce(messagingMenu, '.o_notification_counter',
+        "should display a notification counter next to the messaging menu");
+    assert.strictEqual(messagingMenu.$('.o_notification_counter').text(), '0',
+        "should display a counter of '0' next to the messaging menu");
+    testUtils.dom.click(messagingMenu.$('.dropdown-toggle'));
+    assert.containsNone(messagingMenu, '.o_preview_info',
+        "should display no preview in the messaging menu");
+
+    messagingMenu.destroy();
+});
+
+QUnit.test('messaging menu widget: respond to notification prompt', function (assert) {
+    assert.expect(4);
+
+    var messagingMenu = new MessagingMenu();
+    testUtils.addMockEnvironment(messagingMenu, {
+        data: this.data,
+        services: this.services,
+    });
+    messagingMenu.appendTo($('#qunit-fixture'));
+
+    assert.containsOnce(messagingMenu, '.o_notification_counter',
+        "should display a notification counter next to the messaging menu");
+    assert.strictEqual(messagingMenu.$('.o_notification_counter').text(), '1',
+        "should display a counter of '1' next to the messaging menu");
+
+    testUtils.dom.click(messagingMenu.$('.dropdown-toggle'));
+    testUtils.dom.click(messagingMenu.$('.o_preview_info'));
+
+    // simulate "default" response, which is equivalent to "Not Now" in Firefox.
+    this.requestPermissionDef.resolve("default");
+
+    assert.strictEqual(messagingMenu.$('.o_notification_counter').text(), '0',
+        "should display a counter of '0' next to the messaging menu");
+
+    testUtils.dom.click(messagingMenu.$('.dropdown-toggle'));
+    assert.containsNone(messagingMenu, '.o_preview_info',
         "should display no preview in the messaging menu");
 
     messagingMenu.destroy();