title: Which browser is easier to develop plug-ins for? Chrome or Firefox?
body: <p>I'd like to develop a small plug-in for web browsers, namely Chrome and FireFox.  Which one is easier† to develop for a first projet?  I am very unfamiliar with this space as I spend most of my days coding server-side Java.</p>
  
  <p>†: Easier in my context means:</p>
  
  <ul>
  <li>shallow learning curve</li>
  <li>least amount of additional tooling <em>required</em></li>
  <li>a Java like syntax, i.e.: JavaScript</li>
  <li>solid API documentation</li>
  </ul>
  
  <p>If it matters, here is the goal of my plug-in:</p>
  
  <ul>
  <li>find an image tag in a page with a specific tag.  Example: <code>&lt;img src="bobisyouruncle.jpg" findme="found" /&gt;</code></li>
  <li>send the image to my remote RESTful web service </li>
  <li>overlay an image onto the above image (or replace it)</li>
  <li>allow simple configuration and storage for authentication against the web service</li>
  </ul>
  
  <p>Answers from folks with direct experience coding for both browsers are greatly appreciated.</p>