title: running selenium webdriver with firefox profile results in WebDriverError: connection refused
body: <p>I am trying to start a selenium test with the following command</p>
  
  <pre><code>selenium-side-runner --server http://127.0.0.1:4444/wd/hub --debug -c 
  "browserName='firefox'  moz:firefoxOptions.args=[-profile, /home/seluser.  
  /firefox-profile/myprofile]" --output-directory ~/out ~/portallogin.side
  </code></pre>
  
  <p>The profile is loaded correctly in firefox then but the test fails to run with the following exception:</p>
  
  <pre><code>Test suite failed to run
  
  WebDriverError: connection refused
  Build info: version: '3.141.59', revision: '82b03c358b', time: '2019-04-30T22:04:50'
  System info: host: 'd871aae50a23', ip: '172.17.0.3', os.name: 'Linux', os.arch:
   'amd64', os.version: '4.4.0-1075-aws', java.version: '1.8.0_212'
  Driver info: driver.version: unknown
  remote stacktrace: 
  
    at Object.checkLegacyResponse (../../../usr/lib/node_modules/
  selenium-side-runner/node_modules/selenium-webdriver/lib/error.js:585:15)
    at parseHttpResponse (../../../usr/lib/node_modules/
  selenium-side-runner/node_modules/selenium-webdriver/lib/http.js:551:13)
    at Executor.execute (../../../usr/lib/node_modules/
  selenium-side-runner/node_modules/selenium-webdriver/lib/http.js:486:26)
  </code></pre>
  
  <p>While running the same test without the profile beeing loaded is working.</p>
  
  <p>I have found this issue: <a href="https://github.com/SeleniumHQ/selenium-ide/issues/616" rel="nofollow noreferrer">https://github.com/SeleniumHQ/selenium-ide/issues/616</a> and it looks like a bug.</p>
  
  <p>I tried to add a .side.yml file but that didn't help yet.</p>
  
  <p>It looks like the loading of a profile is disabling the webdriver functionallity in firefox. Any hints how to get it running?</p>