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No real ideas from me - I have found this affects ALL wysiwyg editors and Firefox, and it only affects the meta refresh tag. Most workarounds include a javascript function (location:header, setTimeout()).
I had to play around with the quotes to get mine to work. View your page source when you get stuck and see how the quotes pair up.
Here is how I changed my system_redirect.html file -
(add this after the meta http-equiv 'refresh' tag
<script language="javascript">
function nextpage(){
window.location='<{$url}>';
}
script>
<title><{$xoops_sitename}>title>
head>
<body onload="setTimeout('nextpage()', 4000)">
if the normal refresh doesn't work (after using a wysiwyg editor in FF/Mozilla) the javascript will trigger a page redirection in 4 seconds (4000 milliseconds)
I didn't have to change anything in functions.php (which I like - I don't have to remember the hacks when upgrading modules)