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I have disabled the warning with "do not ask again" check box, now I want to get the warning again. How can I re-enable it?

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Wait, so when I click "don't ask me again" and then press "Stop plugin", it doesn't just stop the plugin automatically without asking me? Grr ambiguous dialog boxes. –  endolith May 16 '13 at 19:10

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up vote 2 down vote accepted

Open the page about:config in a new tab, and reset the pref dom.max_script_run_time: http://kb.mozillazine.org/Dom.max_script_run_time

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The "Don't ask me again" checkbox only applies to the currently running script.

If you haven't ticked it, the warning will pop up approximately every dom.max_script_run_time seconds while the script is still running.

Simply refresh the page (or run another script) and you should get the warning again if your script is taking too long.

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