Dear arejfour, for printing PDF files you have entered Adobe as the default application, but for files with a different extension it is probably FF as the default application.

Check this out.If the problem occurs only with .pdf files or also with .doc or .odt files for example.

I hope I have been helpful

Thank you for your comments. What's odd about this I never had this issue before the recent update. It always opened in Adobe. Something changed

Dear arejfour, I refer you to the link https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox if the problem persists then please ask.

Thank you for your comments. Before the update everything printed using default Adobe Acrobat Reader. Now everything is printing default Firefox. The only other similar situation, like this, is with Chrome. It prints using the default Chrome printing function. You can't enter Adobe as the default in Chrome. You can default print using the Windows default Adobe same as with FF.

Hi, Using Firefox 87 on Ubuntu 20.04. My default printer configured at the OS level is PDF. But I'd like to use "Print to file . . ." as it gives the opportunity to name the file and where to put it.

Looked at the above and other suggestions but I can't get this to work. Always have to manually select it.

Any help appreciated.

Cheers,

xian