gistfile1.txt

// searchItem.click() will load a page, I want to Assert that page does not 
// have the text 'error' in it
// Fails on treeherder with 
// Uncaught exception - at chrome://mochitests/content/browser/browser/components/search/test/browser/browser_contextmenu.js:126 - TypeError: can't access property "innerHTML", content.document.body is null
  
  let loaded = BrowserTestUtils.waitForNewTab(win.gBrowser, expectedBaseUrl);
  searchItem.click();
  let searchTab = await loaded;
  let browser = win.gBrowser.selectedBrowser;
  await SpecialPowers.spawn(browser, [], async function() {
    Assert.ok(
      !/error/.test(content.document.body.innerHTML),
      "Ensure there were no errors loading the search page"
    );
  });