It's a quick ref of functions for an autocomplete list.

If you have this in your html as the only form:

  <form>
    <input type="text" id="pattern"/>
    <input type="text" id="show" value="quickref" />
  </form>
  <script>
    document.forms[0].pattern = document.getElementById('pattern');
    document.forms[0].show = document.getElementById('show');
  </script>

then include the functions js you will see an autocomplete list of functions when you type into the pattern box. The lists of function names are stored in a compressed string at the top so it's not really obfuscated, just minified. They shouldn't store it minified though.

That's so weird. Why wouldn't they just use HTTP GZip.