question about extension. with present.

hi people. since last year i wasn't active in the comunity, after a few comes and go i forgot some things.

I used to remember an extension or something like that for steam that allowed you to see other users steamgift and steamtrade post direct from steam. can anyone tell me what its name?

and for the thanks a little present. fast giveaway

Que es blanco por dentro y amarillo por fuera