On sims 3 ambitions is it possible to have a big house fire as a firefighter?

If you mean the first ever Sims games (Sims 1) then yes you and even do on sims 2 and sims 3.

Here's how:

First of all you need a computer in your house

Second, go on your computer look up jobs and there's a list of jobs (careers)

Third, find fireman (women if girl) then it ask if you want to be firefighter click, yes

and you're a firemen/women.