Issue 6717 - Part 2: run qunit in headless firefox

test/firefox.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 const firefox = require("selenium-webdriver/firefox");
 const {Command} = require("selenium-webdriver/lib/command");
 const {ensureFirefox} = require("../adblockpluscore/test/runners/" +
                                 "firefox_download");
 
 function reportElements(test, driver, success)
 {
   return driver.findElements(
     By.css(`#qunit-tests ${success ? ".pass" : ".fail"} .test-name`)
   ).then(elements => Promise.all(elements.map(elem =>
-        elem.getAttribute("innerHTML").then(data => test.ok(success, data))
+    elem.getAttribute("innerHTML").then(data => test.ok(success, data))
   )));
 }
 
 exports.runFirefox = function(test)
 {
   // https://stackoverflow.com/a/45045036
   function installWebExt(driver, extension)
   {
     let cmd = new Command("moz-install-web-ext")
       .setParameter("path", path.resolve(extension))
@@ skipping 53 matching lines @@
       driver.quit();
       test.done();
     }, err =>
       driver.quit().then(() =>
       {
         throw err;
       })
     );
   });
 };