title: Reached error page: about:neterror when trying to navigate to other tabs if there is a form submit under that tab
body: <p>when I use Selenium to do automation testing, I hit an issue, here are all scenarios:</p>
  
  <p>There are several tabs on top of the page, now that I want to click those tabs and fill up all forms under those tabs, but if I submit <code>formA</code> which under <code>tabA</code>, then I can not navigate to other tabs automatically. If I didn't submit the form data, the issue will not be happened. Here is the log:</p>
  
  <pre><code>1513753361368 Marionette DEBUG Received DOM event "beforeunload" for "https://192.168.1.20/link.cgi?1513753343333"
  1513753361388 Marionette DEBUG Received DOM event "beforeunload" for "https://192.168.1.20/link.cgi?1513753343333"
  1513753361391 Marionette DEBUG Received DOM event "pagehide" for "https://192.168.1.20/link.cgi?1513753343333"
  1513753361391 Marionette DEBUG Received DOM event "unload" for "https://192.168.1.20/link.cgi?1513753343333"
  1513753361427 Marionette DEBUG Received DOM event "DOMContentLoaded" for "about:neterror?e=connectionFailure&amp;u=https%3A//192.168.1.20/network.cgi&amp;c=UTF-8&amp;f=regular&amp;d=Firefox%20%E6%97%A0%E6%B3%95%E5%BB%BA%E7%AB%8B%E5%88%B0%20192.168.1.20%20%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%9A%84%E8%BF%9E%E6%8E%A5%E3%80%82"
  org.openqa.selenium.WebDriverException: Reached error page: about:neterror?e=connectionFailure&amp;u=https%3A//192.168.1.20/network.cgi&amp;c=UTF-8&amp;f=regular&amp;d=Firefox%20%E6%97%A0%E6%B3%95%E5%BB%BA%E7%AB%8B%E5%88%B0%20192.168.1.20%20%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%9A%84%E8%BF%9E%E6%8E%A5%E3%80%82
  Build info: version: '3.8.1', revision: '6e95a6684b', time: '2017-12-01T18:33:54.468Z'
  System info: host: 'PC-20161127KZEG', ip: '192.168.131.1', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_111'
  Driver info: org.openqa.selenium.firefox.FirefoxDriver
  Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 57.0.2, javascriptEnabled: true, moz:accessibilityChecks: false, moz:headless: false, moz:processID: 42248, moz:profile: C:\Users\Administrator\AppD..., moz:webdriverClick: false, pageLoadStrategy: normal, platform: XP, platformName: XP, platformVersion: 6.1, rotatable: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}}
  </code></pre>