Print Packing Slip Arrives Full Screen

Wondering if anyone is having the same issue which has occured in the past couple of days…When printing the Packing Slip from the button on the Orders page the window it opens arrives full screen before the Print dialogue window opens. After printing the window is still full screen and where I was able to click on the orders page in the background I cannot now achieve this, I have to close the Packing slip screen and it is annoying me. This only happens on Firefox and not on Edge, Firefox is my browser of choice and Amazons response to use a different browser is not well received. And yes I have tried the usual reload, delete cache etc. so I don’t think it is a browser issue.