Found a way that involves enabling privileage on UniversalBrowserWrite that will give the user a dialog box whether they wish to allow this or not.
The following code will make a modal pop up in Firefox even in 2.0 version
Code:
netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserWrite");
winHandle = window.open("popup.html", ID, "modal,toolbar=false,location=false,directories=false,status=false,menubar=false,scrollbars=no,resizable=no,left="+left+",top="+top+",width="+width+",height="+height);
winHandle.focus();
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