Those options comes from your printer driver/software. So what kinda of printer are we talking about?

I am printing on a HP Laser Jet 3052 and a Ricoh MP C4503.

When printing from Explorer, both printers recognize the change in orientation and print correctly. It is only printing from Firefox that I have this problem. I believe my printer settings are correct.

kwyett said

I need to regularly print documents that have portrait and landscape orientation in the same document. ...

What format is that document? Is that a PDF file?

If so, I don't think the PDF reader in Firefox (PDF.JS) is sophisticated enough to be able to switch between Portrait and Landscape orientation when printing thru Firefox. Plus I don't think the Print functionality in Firefox is able to do that either. Rare that an online page mixes formats. It has been many years, but I do recall having to re-print the Landscape pages for a large online manual for something after seeing the change in format partway thru the document; fortunately it was a small number of consecutive pages in the middle of the document.

And yeah, Internet Explorer can do that, it is part of the entire Operating System. Firefox uses its own cross-browser print engine to support Windows and Linux; and MacOSX to a lesser degree (Firefox uses less of its own "engine" and more of what's in OSX.

My advice is to use an external PDF application with Firefox for printing files like that. Those external applications use the OS-resident print engine directly and won't thru Firefox or any other print engine. https://support.mozilla.org/en-US/kb/disable-built-pdf-viewer-and-use-another-viewer