title: .sort not working with Firefox
body: <p>I wrote a Javascript app that I didn't think any modern browser would have any issue with, but when I tested it, it worked fine with Chrome, Safari, Opera, even IE… but not Firefox.</p>
  
  <p>This is the sort in question:</p>
  
  <pre><code>var sorted = Object.keys(teams).sort(function(a, b) {
      return -(teams[a][sortBy] &lt; teams[b][sortBy])
  });
  </code></pre>
  
  <p>Here's a JSfiddle I made to demonstrate - <a href="http://jsfiddle.net/Aq6sc/1/" rel="nofollow">http://jsfiddle.net/Aq6sc/1/</a></p>
  
  <p>What that fiddle should do, is when you click on one of the categories, it should show you 3 "columns".  The team name, the category name, and the category value.  They should print sorted by category value ascending.  And it does in every browser except Firefox.</p>