Awesome thread! I didn't even know about about:config i tweaked a few other things as well in there, it's running so nicely =) either it's power of suggestion or it's actually working- either way I'm impressed =) i award thee 1 internets.
I just heard about this website in an email. it's filled with css scripts for customizing Firefox (and a few others), includes a "clicktoplay" flash blocker!