Comment 52 for bug 91759

(In reply to comment #23)
> Also, I don't know if this makes sense, but, would it be possible to move this
> to one layer above so that it works for any type of file-open? Assuming we are
> able to dynamically set the timeout and avoid multiple dialogs/timeouts?

That makes a lot of sense to me:
I'd love the timeout to not show an unspecific error message, but work and look very much like the dialog that opens in FF whenever a script on a page takes to long to execute, like "this file takes unexpectedly long to load, do you want to continue or stop loading the file". And it would be great if the warning dialog doesn't block the ongoing load-process, but simple disappear if the load finished with out the user reacting to the notification.

Unfortunately, that's not a trivial thing to do and currently beyond my skills.