This is part of changes after Firefox 98 that goes against all prudent download choices. You either live with this Firefox change or go online and find posted help on how to change the download behavior back to past Firefox where it ask you were to download to or how to open a file. I post many times text on how to do this but any posted links on this gets removed when it's posted.

I post many times text on how to do this but any posted links on this gets removed when it's posted.

The posts were hidden, not removed. It was wrong information as what you kept posting was only applicable for Firefox 98.0 to 101.0 while for 102.0 to current there is a newer Preference. I have told you this in replies to you and PM's many times but you ignore it.

Below the setting you mention, under the heading Applications, have you selected Always ask?

If that doesn't solve the problem, there is a preference you might change in about:config. I'll post details if required.

You can change what Firefox does when you download a PDF. By default, Firefox will show the PDF in a tab. If you want to decide for each one where to view it, or where to save it, you can change your PDF setting from "Open in Firefox" to "Always ask". If you pretty much never want to view PDFs in a Firefox tab, you can change the setting to "Save File". This article has the steps: View PDF files in Firefox or choose another viewer.

Can you find a setting that works the way you want?