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I have it but I don't see it. if you have the section and sheet #
My unresearched guess is that most of the holes are for wires and vacuum lines. There are mechanical holes for the brake master, steering, clutch, wiper motor, wiper door actuator, and hood latches. Otherwise, I'm thinking wires and hoses. In the AIM, you'd need to look at the section for each component installation, like headlight, wipers, or climate vacuum lines, or wiper motor, or electric windows, etc. It is on those component pages where the firewall location will be indicated.
Alternatively, post a photo of a few unknowns and we'll tell you in short order what goes there and if a grommet or something else is used to help seal the hole and protect the component.