Scripting Firefox

[_pi]

i already ask this in the mozilla extension development forum,
but maybe you have also an idea.

i want to check on mouse X2 if there is something to navigate forward
if not then my script has to check if there a next button on the page exists
(or in a forum 1 2 3 etc)

do you know if it is possible to send javascript from qm to ff and retreive results ?
i know about how to write the javascript functions for firefox ...

thanks