I am experiencing problem with Firefox 32 when I bind action on click event of span element inside a button element. Other browsers seems to works well.
Here the cod
As far as i known clicking the children elements won't work because it is nested inside a button. A button is not container for child elements - only for text.
If you try like below it always tell that you clicked the button.
So, my suggestion is to use another span or a div
Hope it helps...
Note: Your code will work in chrome but not in firefox and my answer is alternative solution for making work in firefox