To be sure, you should:
* Consult a repair manual specific to your 1995 Firebird's engine: A Haynes or Chilton manual will have diagrams and detailed instructions.
* Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to look up parts diagrams for your specific year, make, and model. Find the crankshaft position sensor in the diagram; it'll show you its location.
Without knowing the precise engine in your Firebird, I can't give a more exact location. Always refer to a reliable source for your specific vehicle before attempting any repairs.