title: Firefox - Disable 'debugger' keywords
body: <p>How do I tell Firefox not to stop if it sees a <code>debugger</code> keyword?</p>
  
  <p>I need to avoid a continuous <code>debugger</code> loop in case the website uses debugging protection generating <code>debugger</code> statements on the fly using timers.</p>
  
  <p>Here is an example. In case you open the debugging console the script will throw tons of debugger statements, which will block you from normal debugging work.</p>
  
  <p>An example website is <a href="http://www.avito.ru" rel="noreferrer">http://www.avito.ru</a> - the biggest classified site in Russia. Open it and then open the debugger console and it will be immediately stop at the <code>debugger</code> keyword in generated script.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>(function(x/**/) {
      (function(f){
          (function a(){
              try {
                  function b(i) {
                      if(
                          (''+(i/i)).length !== 1 ||
                          i % 20 === 0
                      ) {
                          (function(){}).constructor('debugger')();
                      } else {
                          debugger;
                      }
  
                      b(++i);
                  }
  
                  b(0);
              } catch(e) {
                  f.setTimeout(a, x)
              }
          })()
      })(document.body.appendChild(document.createElement('frame')).contentWindow);
  });</code></pre>
  </div>
  </div>
  </p>