How хан I использовал многообразный network connections from the same host?

Suppose I could использовал both в wired and wireless connection; now, let's say I want to run firefox using the wireless and steam using the wired, how хан I achieve that? How хан I plug them in? First connect wired then wireless? Then, what should I do next? гm using Ubuntu 14.04 64.

Cheers!