What you are experiencing is a cross-site scripting security restriction. Since the domains of the frames are from different domains, the script(s)on one frame cannot read the url of the other (and vice versa). At first glance it may seem that being able to read the url from each other is "harmless" but you need to consider the sites where userids and/or password (or any other "account" information is passed over the url). For this reason, the browser forbids it.
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by: mltsyPosted on 2008-10-20 at 10:46:59ID: 22760263
Hmm... I don't get the error unless I turn on firebug - is it causing a problem for you normally?
If not, I would say it's possibly just a problem with firebug trying to interact across domains - or maybe you should try mootools 1.2 in case it's a bug in mootools that has been fixed (it looks like that's where the bug is happening).