OK , this might have been already asked similar question . couple of more thread wit hsame questions are there. but still that does not help for me hence asking again.
this is a send hot key activity for page down .
firefox extension is working fine. my work flow enters data in to all the feilds of the same firefox portal. this page down is needed as the portal is quite large and need to scroll down to see some of the ui elements.
p.s : interestingly ,control + end (bottom of the page) is working as send hot key !! on the same selector.