Can firebenders do it?

Me too.

Just put it on a t-shirt real quick. Here, check this out:
http://www.customink.com/designs/fire/chs0-000y-fzw5/share/?pc=EMAIL-40778&cm_mmc=share-_-emailb-_-button-_-end

Poor Zuko <3

Actualy no. Because their firebenders not heatbenders. If they were, they could also control lava but they can't. But I think the Avatar can because it's a mixture of rock and fire.