I've got an onunload handler at a page which issuing an ajax call to SFSB to clean up something and no callback. It runs well on IE but raises error on Firefox saying "Seam is not defined". Actually all works are done properly. The only thing might be that asyncReq.onreadystatechange = function() Seam.Remoting.requestCallback(asyncR...) at Remoting.js gets executed after SFSB returning but at this stage the page is already unloaded and the script doesn't existing at all. Any idea to fix this. Here is a relevant link talking about it: http://www.ghastlyfop.com/blog/2007/01/onreadystate-changes-in-firefox.html View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077086#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...