title: How can I activate the Firefox debugger?
body: <p>While debugging a JavaScript program I was writing with Firebug, the <em>Script</em> panel stopped working and I got the following message:</p>
  
  <p><img src="https://i.stack.imgur.com/uLveP.png" alt="debugger not activated"></p>
  
  <p>I went through all menus and sub-menus I could find but didn't see a option to re-enable this feature. The <a href="https://getfirebug.com/wiki/index.php/Console.log" rel="nofollow noreferrer"><code>console.log()</code></a> command doesn't work in Firebug as well (while it does work in the built-in devtools' console).</p>
  
  <p>How can I re-activate the Firebug <em>Script</em> panel? What may have caused this?</p>