code: function _enableOrDisable(id, enable) {
          var result = new $.Deferred(),
              extension = extensions[id];
          if (extension && extension.installInfo) {
              Package[(enable ? "enable" : "disable")](extension.installInfo.path)
                  .done(function () {
                      extension.installInfo.status = enable ? ENABLED : DISABLED;
                      extension.installInfo.metadata.disabled = !enable;
                      result.resolve();
                      exports.trigger("statusChange", id);
                  })
                  .fail(function (err) {
                      result.reject(err);
                  });
          } else {
              result.reject(StringUtils.format(Strings.EXTENSION_NOT_INSTALLED, id));
          }
          return result.promise();
      }
docs: @private
  
  Disables or enables the installed extensions.
  
  @param {string} id The id of the extension to disable or enable.
  @param {boolean} enable A boolean indicating whether to enable or disable.
  @return {$.Promise} A promise that's resolved when the extension action is
  completed or rejected with an error that prevents the action from completion.