How do you remove the airbox on a 1999 ford explorer?

Answer 1

It is attached in the two places you can't see: at the bottom (MAF end) and on the passenger side wall. If you can wedge something flat under it between the lower airbox and body directly below the MAF, you should be able to pry it up easily.

I wouldn't worry about breaking it. It'll sit there just fine without the mounting hardware and the box itself isn't going to break if you're not poking at it with something sharp. Pull that sucker up! SoLo.