Thank you for that clarification. I wasn't familiar with inject versus run.
My final code is:
$("body").scrollTop($("div.footer").offset().top - $("body").offset().top + $("body").scrollTop());
This works when I inject instead of running.
I verified that this code in Chrome Developer Tools console.
When I tried the same code in Firebug console, that line didn't work so, I wasn't surprised when it didn't work in Firefox under Galen.
Seems like a Firefox issue, not a Galen issue.