title: Running e2e tests using Protractor multiCapabilities config but limit max Webdriver instances
body: <p><strong>Context</strong></p>
  
  <p>I am trying the brand new Protractor 0.19.0 with the multiCapabilities config option. It is actually working as described in the docs :</p>
  
  <ol>
  <li>It makes running tests on multiple browsers easier (no need for grunt, nor script, only 1 config file).</li>
  <li>It makes tests running in parallel</li>
  </ol>
  
  <p>The second point is problematic for me. One of my app doesn't handle multiple connection to the data, implying that the tests fail.</p>
  
  <p><strong>My question is:</strong></p>
  
  <p>Is it possible to limit the maximum number of instances of Webdriver in order to disable parallel testing for this app?</p>
  
  <p><strong>What I have tried</strong></p>
  
  <p>I've found in <a href="https://code.google.com/p/selenium/wiki/Grid2">Selenium Webdriverjs Grid2 wiki</a> that there's a <code>maxSession</code> parameter that would perfectly fit to my case! But I tried to add it in my Protractor config, without success.</p>
  
  <p><code>maxSession</code> is also in the <a href="https://code.google.com/p/selenium/wiki/DesiredCapabilities">Desired Capabilities</a>. Anyone knows if it's working yet?</p>
  
  <p>Here is the link to the <a href="https://github.com/angular/protractor/pull/492">multiCapabilities PR topic</a>, I left a comment there.</p>
  
  <p>If you need more info, feel free to ask :)</p>
  
  <p>Thanks in advance!!</p>
  
  <p><strong>EDIT:</strong> Dedicated <a href="https://github.com/angular/protractor/issues/556">GitHub issue</a></p>
  
  <p><strong>EDIT2:</strong> I recently tried to add <code>seleniumArgs: ['-maxSession=1']</code> to my Protractor config, unfortunaltely this doesn't work too...</p>