Firefox printing only 1st page

I was having the same issue. Turns out, the root tag had display: flex on it. After changing this to display: block, the rest of the content was displayed. I'd recommend going up your DOM tree and checking every display attribute.

I just found out, that from an element with

display:inline-block; 

only the first page is printed and everthing else is hidden. setting this to

display:block;

was the solution in my case.