GWT 2.4 issue with Firefox latest version

I have an web page developed with GWT 2.4 and I am using latest version of Firefox. Since Firefox 13, release my GWT code for the 'onclickEvent' does not seems to work properly. On click of a button I am opening a window and when clicking the button  again(without closing the pop up window)  I m focusing the new window

Now, when I am closing the window(pop up widow) and clicking the button for the second time, this time the op up window is not working .

Many thanks to helpers....

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