Last few posts were about situations where rtmpdumphelper does not work.
This post is about where it still does work.
It works with opera portable
http://www.opera-usb.com/operausben.htm
By default rtmpdumphelper sees main browser only and portable browsers have to be set up.
Option menu - add support for web browser - select.
It can be seen in RTMPDumpHelper.cfg if browser is set up, line:
WebBrowsersListManual=
I tried google chrome portable for my curiosity, could set it up, but rtmpsuck stayed idle.