Angular directive to accomplish two-way data binding for contenteditable elements with ng-model

contenteditableDrct.js

/**
 * Two-way data binding for contenteditable elements with ng-model.
 * @example
 *   <p contenteditable="true" ng-model="text"></p>
 */
app.directive('contenteditable', function() {
  return {
    require: '?ngModel',
    link: function(scope, element, attrs, ctrl) {

      // Do nothing if this is not bound to a model
      if (!ctrl) { return; }

      // Checks for updates (input or pressing ENTER)
      // view -> model
      element.bind('input enterKey', function() {
        var rerender = false;
        var html = element.html();

        if (attrs.noLineBreaks) {
          html = html.replace(/<div>/g, '').replace(/<br>/g, '').replace(/<\/div>/g, '');
          rerender = true;
        }

        scope.$apply(function() {
          ctrl.$setViewValue(html);
          if(rerender) {
            ctrl.$render();
          }
        });
      });

      element.keyup(function(e){
        if(e.keyCode === 13){
          element.trigger('enterKey');
        }
      });

      // model -> view
      ctrl.$render = function() {
        element.html(ctrl.$viewValue);
      };

      // load init value from DOM
      ctrl.$render();
    }
  };
});

not working for me in firefox