Im experiencing the same issue issue as in this Archived Question: https://support.mozilla.org/en-US/questions/1349572 When I try to print specifically in black and white, Firefox starts the printing and send the pages to the printer for printing. But this process does not get beyond 2 pages. After 30-60 seconds of loading, the 2 pages print and firefox just shows a generic error "That an error has occurred". '''My testing:''' - Remove and re-add printer -> Same issue - Try in Acrobat -> Same issue - Try in Chrome -> No issue - Try with other Printer -> Works when not B/W, same issue with B/W - Try with same printer not B/W -> Works - Reset printer settings manually -> Same issue - Tried to delete Firefox Caches/Cookies etc. -> Same issue - Reset Firefox Print settings -> Same issue - Firefox already up to date - Printed to Microsoft Print to PDF, then Printed that -> Works - Opened the file in Word: > Noticed that there are black pages when looking at the print preview > Noticed in Adobe Acrobat, that some pages are wider and some slimmer. > After more testing: The printer prints the first page and the 1st page after a wider page, then stops. > So if the 1st Page is a wider page -> Prints 2 pages > If the 1st page is slimmer -> Only prints the first page. (Filetype is already PDF/A) Currently the workaround is to set Acrobat as default option when opening Acrobat and this should solve the issue. But this seems like some form of bug when Firefox has different PDF Formats/Page width/? (not sure what is is either). Id like to avoid downloading an extension, so do any of you know of a better solution?