title: How do I get MathJax to enable the mhchem extension in ipython notebook
body: <p>Okay, this has been a very frustrating adventure for me.  I have spent many hours over several successive days trying to get MathJax to enable and recognize the mhchem extension within a Markdown cell in ipython notebook.  Math expressions worked fine, but the mhchem macros <code>\ce</code> <code>\cf</code> <code>\cee</code> just go unrecognized.  I have tried enabling the extension in the <code>MathJax/config/default.js</code> file.  I tried putting the following script code with the Markdown window</p>
  
  <pre><code>&lt;script type="text/x-mathjax-config"&gt;
  MathJax.Hub.Config({TeX: {extensions:["TeX/mhchem.js"]}
  ...
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>I have tried every trick and tip I could find on the internet.  Nothing seems to work.</p>
  
  <p>I am running debian wheezy.  I thought maybe the default mhchem and MathJax packages were causing the problem, so I installed a custom version of MathJax for ipython notebook into my profile_default/static directory and configured ipython to use this.  Again, math fine, chemistry a no go. I am able to use the mhchem extensions directly from TeX but MathJax just refuses to load the extension or recognize the <code>\ce</code> tags.</p>
  
  <p>I am stumped!</p>
  
  <p>Anyone have any ideas?</p>