text: import time
  from selenium import webdriver
  
  DASHBOARD_LIST = 'the-dashboard-list.txt'
  TAB_ROTATION_PERIOD = 15  # 15 second tab rotation
  
  
  def pull_list(list_file):
      with open(list_file) as f:
          content = f.readlines()
      # Remove whitespace characters from the end of each line
      content = [x.strip() for x in content]
  
      return content
  
  
  def open_dashboard(url_list, driver):
      max_tabs = len(url_list) - 1
      tab_ordinal = 1
  
      for dashboard_url in url_list:
          driver.get(dashboard_url)
          if tab_ordinal <= max_tabs:
              browser_tab = 'tab' + str(tab_ordinal + 1)
              tab_open_command = "window.open('about:blank', '" + browser_tab + "');"
              driver.execute_script(tab_open_command)
              driver.switch_to.window(browser_tab)
              tab_ordinal += 1
  
  
  def rotate_dashboard(url_list, driver):
      max_tabs = len(url_list) - 1
      tab_ordinal = 1
  
      while tab_ordinal <= max_tabs:
          browser_tab = 'tab' + str(tab_ordinal + 1)
          driver.switch_to.window(browser_tab)
          driver.refresh()
          time.sleep(TAB_ROTATION_PERIOD)
          tab_ordinal += 1
  
  
  def main():
      browser = webdriver.Firefox()
  
      dashboard_list = pull_list(DASHBOARD_LIST)
      # The first browser tab is not in the tab rotation sequence (it is just a placeholder)
      dashboard_list.insert(0, 'https://python.org')
      open_dashboard(dashboard_list, browser)
  
      running = True
      while running:
          new_dashboard_list = pull_list(DASHBOARD_LIST)
          new_dashboard_list.insert(0, 'https://python.org')
          # Detect new content in the dashboard list
          if new_dashboard_list != dashboard_list:
              dashboard_list = new_dashboard_list
              browser.stop_client()
              browser.quit()
              browser = webdriver.Chrome('chromedriver', chrome_options=chrome_options)
              open_dashboard(dashboard_list, browser)
  
          rotate_dashboard(dashboard_list, browser)
  
  
  main()
  