title: Equivalent of Firebug for Thunderbird
body: <p>When I build a newsletter and send it to myself as a test, I would like to be able to analyze the resulting HTML in my email client (Thunderbird).</p>
  
  <p>Is there a tool similar to Firebug but for Thunderbird? I found one called "DOM Inspector" but it is pretty weak and hard to use...</p>