Just curious - what variety is it and has it produced fruit before?
I am thinking that there is something else going on with the tree as well. There are lots of bare areas on the outer areas of those branches. Leaves would still be attached like the ones you have pictured if it was only recent FB. Maybe it got hit bad with FB last year and you just didnt notice. Last year was a bad year for FB across much of the USA. Some larger FB cankers down on the trunks of the tree?
It had more dead leafs attached but we had a hail storm Friday night and everything not attached WELL was pounded off.
I looked at the trunk of the tree and didn't notice anything I thought was unusual. But I'm not familiar with fireblight cankers so I could have looked over something.