OOOoooppps very sorry it was my fault!
On looking through our code it turns out that due to a previous version of the editor constantly inserting <link tags we have code that strips out the link tags!
Our code looks for <link tags then looks to see if the tag has [acms is inside it. Now because firefox is converting [ to %5B our code is not finding the tag and therefore assuming the editor has added a link tag.
So a different question now, why is firefox converting [ to %5B and IE is not?
<link href="%5Bacms:template%20field=stylesheet%5D" type="text/css" rel="stylesheet" />
I would rather it didnt, is there anything to stop it?
Thanks
Andy