Fix multi-selection of cards in Firefox

UI/WebServerResources/js/Contacts/AddressBook.service.js

@@ -246,6 +246,17 @@
     }
   };
 
+  /**
+   * @function isSelectedCard
+   * @memberof AddressBook.prototype
+   * @desc Check if the specified card is selected.
+   * @param {string} CardId
+   * @returns true if the specified card is selected
+   */
+  AddressBook.prototype.isSelectedCard = function(cardId) {
+    return this.selectedCard == cardId;
+  };
+
   /**
    * @function $selectedCount
    * @memberof AddressBook.prototype