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I got this also, and I'm using asp.net with jquery on client side, suddenly I discover that this function was not working on Firefox, and the reason why is because I was using a direct object reference inside this function example:

Client Script:

...

objDiv.style.display = 'none';

...

Html:

...

<div id='objDiv'></div>...

All code after the script reference was not running, so I change the code to:

...

var obj = $get('objDiv');

obj.style.display = 'none';

...

And it start working, you can change the $get() function for any other like getElementbyId or jquery function, after this all the code was working.

Hopes that help