title: Open the about:addons page with my plugin's options page on screen
body: <p>In Firefox, is there a way to open the add-on's own options page within <code>about:addons</code> through a button in the add-on? (Not just the <em>options.html</em> page by itself, but within the <code>about:addons</code> page, the same one that you can get to when pressing "more" beside the description of the add-on).</p>
  
  <p>I got this:</p>
  
  <pre class="lang-js prettyprint-override"><code>function OpenOptionsMenu() {
    browser.tabs.create({
    url: "???"
  });
  </code></pre>
  
  <p>But, I have no idea what to put as the URL.</p>
  
  <p>I found this: <code>browser.runtime.getURL('/options.html')</code>, but that will only get the options page by itself.</p>