When i type some text in cute editor and like cick here and click on insert hyperlink icon it shows me a popup and in that pop if i enter any my user defined tags like [viewonlie]  and click ok the cute editor does  enter href on this tags it just shows empty <a></a> tags. it works fine with IE but there seems to issue with FireFox i am using Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4. It is  easily reproducible in any of your example just  put any tag in hyper link pop up and it will enter href on tags.