Hi

To see this you would have to print from the desktop version of Firefox.

Firefox for iOS is designed for mobile use and a smaller screen -as a result it has a different way of doing things compared with desktop Firefox.

Sorry, I was not specific. I am using a Mac Mini. I just prefer the printer choices and dialog with my OS Mojave to the Firefox.

Enter about:config in the URL bar and set print.prefer_system_dialog = true.