我对 getItems（）显示了在某些情况下这个函数被定义为 native function 。我不知道为什么。为了避免这种麻烦，尝试重命名函数 getItems 。

http://jsfiddle.net/u6bKr/3/

更新：正如在Boris Zbarsky的评论中指出的那样，当添加窗口时，这个麻烦也可以避免。在 getItems（）（例如 window.getItems（））

Why is this simple link example not working in Firefox? It is working in IE and Chrome.
js fiddle sample
I am using windows XP. My Firefox version is 16.0.

My research for getItems() showed what in some situations this function is defined as native function. I don't know why. To avoid this trouble try to rename function getItems.

http://jsfiddle.net/u6bKr/3/

UPDATE:

As specified in comment by Boris Zbarsky this trouble can be also avoided when adding window. before getItems() (e.g. window.getItems()).