Were Firestone Tires originally the only tires on Ford Trucks?

Were Firestone Tires originally the only tires on Ford Trucks?

No and what year i had a 1976 f150 it came with uniroyals

No when Ford got into the truck market, solid tires were used to handle the loads… So at least the rears were a non pneumatic tire… At one point Lucas was the supplier… Firestone's pneumatic tires usually paired on the front.
Here's a summary, you can check the references:
http://auto.howstuffworks.com/1903-1919-ford-trucks3.htm
Mac's Auto parts or Coker tire, are also good references for what was going on a century ago…

For decades Ford has used multiple tire brands on their vehicles. They certainly included Firestone, but they also used Bridgestone, Goodyear, Uniroyal, and others.