User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3 If you have an XMLHttpRequest object, and you want to recive data synchronous it will not work. Example: var aVar = 'some text'; request = new XMLHttpRequest; request.open('GET', 'http://localhost/someurl.js', false); request.onreadystatechange = function() { if (request.readyState == 4) { aVar = request.responseText; return; } request.send(null); alert(aVar);//it will alert 'some text' instead of the value of request.responseText I've tested with IE5.5/6 Opera 8.54 and works fine with them; Reproducible: Always

testcase loading "/" in the request

*** This bug has been marked as a duplicate of 313646 ***

confirm on FF 3.0.1 <script> r=new XMLHttpRequest() r.onreadystatechange=function(){if(r.readyState==4)alert(r.responseText)} r.open('GET','1.txt',false) r.send(null) </script>