MediaWiki:Common.js

var timer = setInterval(function() {
       if ($('.menu ul:first').length) {
           console.log("mobile menu exists");
           clearInterval(timer);
           $('.menu ul:first').after(
                 <ul> \
                      <li> \
                      <a href="/donation.html" \
                            class="mw-ui-icon mw-ui-icon-before mw-ui-icon-minerva-watchlist"> \
                      <span>Faire Un Don</span> \
                      </a> \
                      </li> \
                 </ul>'
            );
            $(".menu").find(".level2").hide(); // hide level2 until level1 is clicked
            $(".level1").click(function(event){ 
                 $(this).find(".level2").slideToggle(500);
            }); // if level1 is clicked, dropdown level2
       }
  }, 100); // check every 100ms