The problem appears when there is no "scrollbar='yes" if the first Iframe tag also .
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The problem appears when there is no "scrollbar='yes" if the first Iframe tag also .
I'm not aware of any problem in FF when using really tall iframes. Then again, I don't know for a fact that there isn't one. A link to your problem page would help:
Please post a link to the page on your site that contains the problematic script so we can check it out.