Bug #58669 --> don't let the helper app dialog be modal, this prevents

the external handler from properly processing incoming OnDataAvailable events
while the helper app dialog is up.
r=law,sspitzer
sr=alecf

xpfe/components/ucth/src/nsUnknownContentTypeHandler.cpp

@@ -246,7 +246,7 @@ nsUnknownContentTypeHandler::Show( nsIHelperAppLauncher *aLauncher, nsISupports
                                                     "sss%ip",
                                                     "chrome://global/content/helperAppLauncher.xul",
                                                     "_blank",
-                                                    "chrome,titlebar,modal",
+                                                    "chrome,titlebar",
                                                     (const nsIID*)(&NS_GET_IID(nsIHelperAppLauncher)),
                                                     (nsISupports*)aLauncher );
                     if ( argv ) {