Is there an inline fuse to the rear defroster in a 1991 Pontiac Firebird?
No, there's typically no inline fuse for the rear defroster in a 1991 Pontiac Firebird (or most vehicles for that matter). The protection for the rear defroster circuit is handled by a fuse located in the fuse box, either under the hood or inside the car. You'll need to consult your owner's manual to find the correct fuse for the rear window defroster.