Stop an instance of JavaScript running in one tab

I generally work with multiple (many) tabs open in Firefox. However, a JavaScript running in one tab can hang all of Firefox to the point where I have to stop and restart Firefox. Is there a way to kill / stop the particular script that is running that is causing Firefox to hang without bringing down Firefox entirely ?
I realize NoScript or othert add-ons can be used to block JavaScript entirely, but that's not what I want at this point.

If I could close the offending tab, I would do that and there would be no problem. The problem is that a script running in one tab has hung firefox entirely so that I cannot take any actions through firefox, such as closing the tab in question by clicking on the "X". At that point, nothing in firefox works and the only way out is to kill the firefox process/PID from Windows, or if a message comes up that firefox is not responding, then take the action to stop it. In any case stopping firefox entirely is what I am trying to avoid: it's like having to reboot the OS because one lousy process is causing a problem. What one would ideally like to be able to do is to kill the specific instance of the script (presumably javascript) from outside firefox, which might cause the specific tab to die, but not all of firefox. I generally know what tab is causing the problem because that's the one I'm working in, doing something and then it hangs. 98% of the time when it happens it's the "active" tab. It seems to me that one tab ought not be able to hang firefox entirely, just as one application's process should not be able to hang the OS entirely, and at least there ought to be tools or a method to deal with it without stopping firefox completely.

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Well if the computer crashes, your SOL for using that program again.
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We had done this by writing a file on the user's
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Our application used to check the existence of that
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bye

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Hi,
I must admit I did think Parental Controls (Even if tested in a new Account which would have effected even an Admin Account) would have been a large part of this.
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Mine does as I have Cloned the Drive
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If she is sure she has everything she wants from the "Previous System" then she can delete it.
--- Not relevant, never done a reinstall
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---- Yep, that's what hers looks like.
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--- Nope
Does she use the Icon in the DOCK to launch iChat or is it some other form of Link such as a AppleScript they may use Terminal to do it for her ?
---- She has in the past used the Dock icon. Still uses it, but with the weird result.
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---- An interesting idea. So, being a pretty adept Mac guy, and not adverse to trying 'outside the box' solutions, here's what we did....
I have the same OS version and same iChat version on my machine.
Got her to compress the existing copy of iChat in her Applications folder
'Sent' her a copy of my iChat through my MobileMe iDisk
Guided her through dragging and dropping it into the Applications folder (remember I said 'outside the box'?)
Had her do File>Open on that copy of iChat....
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Stop an instance of JavaScript running in one tab

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