Hello, below I share two links to some information that can be very useful. The first is related to problems printing in the browser: Fix printing problems in Firefox The second about how to print web pages: How to print web pages in Firefox. I hope these links will help you.

When I print a receipt there are usually 3, 4, 5, 6, 7 or more pages and I would love it sooo much if we could be able to have a default setting for 1 page only without having to do it manually over and over and sometimes forgetting to put one page thus printing more that I want - wasting paper, ink, and time.

Yes, currently, you have to change the pages control from All to Custom and then enter the number(s) of the page you want to print.

If it's a web page -- probably won't work on a PDF -- one possible workaround to consider would be printing a selection. If you use your mouse to select the part you want to print, then right-click > Print Selection, the preview panel should show the selection automatically. Is that any faster than specifying a page number?

By the way, there is a new "Ideas" site over here: https://connect.mozilla.org/