title: How to suppress the "checking compatibility of add-ons" dialog in Firefox with Selenium?
body: <p>Since updated to Firefox 12, every time I launch Firefox with a particular profile with Selenium (in python and Mac OS 10.7) it pops up the "checking compatibility of add-ons" dialog, and sometimes this dialog would stay up forever and I have to force-quit it. After forcing quit it, a new instance of the Firefox would continue to launch and finishes the rest of the Selenium script successfully though.</p>
  
  <p>I have tried setting <code>extensions.checkCompatibility</code> to <code>false</code>. This fixed it if I launched Firefox normally, but not if I launch it with Selenium. Any idea on how to suppress this dialog? Thanks!</p>