The seeds are located in the pine cones. When the pine cones get toasted in a fire, the increased heat starts the germination process of the seeds located in them.
Get any pine cone and pound it on the table...you should see the seeds drop free.
I have 100+ conifer trees that I have planted over the last 22+ years I have owned this property, I know where the seeds are located.
The seeds are stored/grown in the cones.
Fir trees have cones, not pine cones.
Just cones.
Thank you...