title: Permission denied: 'geckodriver.log' when running Selenium tests on Firefox
body: <p>I am trying to run selenium tests on firefox 48. I am getting following error.</p>
  
  <pre><code>if log_path:
      log_file = open(log_path, "a+")
      IOError: [Errno 13] Permission denied: 'geckodriver.log'
  
  C:\Users\ABC\getTalent\venv\getTalent\lib\site-packages\selenium\webdriver\firefox\service.py:45: IOError
  </code></pre>
  
  <p>Same code is running fine on Chrome.</p>