Problem with Print settings with O365
Had an employee having a problem printing in Firefox of an Excel document in O365. Everytime they go to print it would show the paper size as A4 and then print to PDF, never showing the printers for the PC. I tried everything on the Fix printing problems in Firefox & worked with an O365 Tech. Upon further testing found this was happening on my PC as well. It seems to be a problem between O365 and Firefox. As below it works fine with Google Drive
Tried with Firefox 54.0.1 (32-bit) Shows A4 paper & straight to PDF
Updated Firefox on my PC too newest version (55.0.2 (32-bit)) Shows A4 paper & straight to PDF.
For the hell of it i testing Google Drive Shows correct size paper and shows all my printers
Office 365 Ticket #30126-6254598 if you want to speak with the Tech @ MS