Iframe content disappear if script loaded from string

I've got strange behaviour of FireFox 3.6-14 (have no 3.0 for now) with whis sample of code
http://pastebin.com/CzzfB709
Short explanation: if we create SCRIPT element and push script text from string and at the same time this script (that comes from string) create IFRAME, then iframe content is reloaded after script finished;
In sample code you can see that we have `scriptText` variable that contains JS code. Then we create SCRIPT tag and put string code there.
What you see: till you not close alert windows, you see text in iframe, but when you close it, iframe became blank.
I also have an example of the same code from string if it pasted directly into HTML. Everything seems fine there.
http://pastebin.com/4JcajiDQ
I ask if anyone can just explain me, why is it hapend.

As I think, this is some kind of a problem inside FireFox. So I just didn't know where to post it. Usually I'll prefer developer discussion group or maillist but I could not find such for FireFox. If you shure that mozillaZine is a best place for it than I'll wait. But I'm not shure whether it is still active community based on it's main page.

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I experimented with that a while ago with JavaFX 1.1, with success: [Creating JavaFX Classes from Java Classes then running?|http://forums.sun.com/thread.jspa?threadID=5368159]
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