I wrote a reply which I then accidentally sent only to Mark. In any case, we 
chatted in #developers about this.

I'm going to do the following:
  1. Update the patch in bug 856977 (dialogs shouldn't be possible during 
beforeunload) so that it doesn't affect the behavior of the checkbox
  2. Put the checkbox behavior changes into a patch in bug 910501 (checkbox 
should do what it says)
  3. File bugs about separating window.print() and window.showModalDialog() 
from alert/prompt/confirm (in terms of enabled/disabled state for a given page)

If we find that we like the behavior after landing 2, we may never actually 
implement 3. If we don't like the behavior, we can either go ahead and 
implement 3 or back out 2 without affecting 1.
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