I've run into this problem from time-to-time. I think the main time I run into the problem is when uploading files to a server, where the form submit is triggered by JavaScript—although I haven't dug around enough to confirm if this is the case or not. Anyway, here's a way to increase the default timeout.
The dom.max_script_run_time is an integer that is the number of seconds to wait before prompting that a script is taking too long to respond. I found this information over at Itchy Hands.
Ever since I upgraded to Firefox 1.5, I’ve been getting some unresponsive script warnings on sites that employ heavy Javascript like Gmail or Bloglines. Curious about it, I dug around and managed to find out how to fix the problem.
To fix it, you’ll need to access the hidden configuration page in Firefox. Just type about:config in the address bar and you’ll get a page full of hidden configurations which you can tweak till your heart’s delight.
In the 'Filter' box, type dom.max_script_run_time. This will narrow the options till only the dom.max_script_run_time option remains. Right-click it and choose Modify. A box pops up. Change the number to something bigger like 20. This is the maximum time a script can run before Firefox considers it 'unresponsive'.
If you can’t find the string in the about:config page, create it by right-clicking anywhere and then choose New—> Integer and enter dom.max_script_run_time. When prompted for the value, use 20.
So far I’ve not had anymore unresponsive script warnings, so I guessed that fixed that problem! However some extensions may also cause similar problems. Hope this helps.
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