What I do in tabbed browsers is open the Post window in a new tab. Fill it in, check it, edit it, and finally post it and close the tab. That way, the screen goes back to the previous tab (FR post) that I was responding to. I finished going down the responses, to the end, and then refresh.
I just ran Ad-Aware, Spybot & TrendMicro on each home LAN PC and got -0- hits. Before I cleaned up my wife's system and removed IE last month, she had over 80 spyware/ad tracking programs! With all the crazy shopping sites she goes to, it's a real testament to FF that her PC is now clean as a whistle.
It's gotten to the point that I'm paranoid about opening IE for anything - even going to MS's site.