Bug 1578584 - Follow-up test fix: Quantumbar WebExt API: Add onResultPicked event.

Increase the extension notification timeout to prevent intermittent test failures. Like this existing test does: https://searchfox.org/mozilla-central/rev/f43ae7e1c43a4a940b658381157a6ea6c5a185c1/browser/components/extensions/test/xpcshell/test_ext_urlbar.js#43

Differential Revision: https://phabricator.services.mozilla.com/D47199

--HG--
extra : moz-landing-system : lando

browser/components/extensions/test/browser/browser_ext_urlbar.js

@@ -1,6 +1,7 @@
 "use strict";
 
 XPCOMUtils.defineLazyModuleGetters(this, {
+  UrlbarProviderExtension: "resource:///modules/UrlbarProviderExtension.jsm",
   UrlbarTestUtils: "resource://testing-common/UrlbarTestUtils.jsm",
 });
 
@@ -46,6 +47,16 @@ async function loadExtension(options = {}) {
   return ext;
 }
 
+add_task(async function setUp() {
+  // Set the notification timeout to a really high value to avoid intermittent
+  // failures due to the mock extensions not responding in time.
+  let originalTimeout = UrlbarProviderExtension.notificationTimeout;
+  UrlbarProviderExtension.notificationTimeout = 5000;
+  registerCleanupFunction(() => {
+    UrlbarProviderExtension.notificationTimeout = originalTimeout;
+  });
+});
+
 // Loads an extension without a main button URL and presses enter on the main
 // button.
 add_task(async function testOnResultPicked_mainButton_noURL_enter() {