Printing a PDF ile
‘When I try to open a pdf file to review or print, it always saves the file rather than opening it, and Firefox will not ask me to choose open or save.’
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It could be a window 10 setting whereas the pdf extension should be assigned or linked to FF.
There are also some tweeks in FF options too; as shown on pic
Try double clicking on the line items to alter their instructions
There's also a help article relating to the setting pictured in the above reply: View PDF files using Firefox’s built-in viewer.