Finally found a fix how to stop firefox downloading each PDF to your local drive - eviltoast
Re: Firefox now saves files that I only wanted to open
connect.mozilla.org
I just learned some good news: Firefox 103 users can switch the case (B) to case (A) using a setting. Could you make this change, turn off the extension(s), and test again? Here's how you can check on that: (A) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click...

Hey guys

Today I got so annyed by firefox’s default behaviour of downloading each and every PDF file to my disk that I went searching for a solution until I had the problem fixed. And it seems like I have finally found it. I have linked the solution but here is the fix in short:

  1. go to about:config
  2. change browser.download.open_pdf_attachments_inline to true

Thank you jscher2000 for the solution!

cross-posted from: https://lemmy.world/post/9785046

  • ares35
    1•7 months ago

    i have ‘open in firefox’ enabled on this pc for pdf. i never get a dl prompt. goes right to the internal pdf viewer every time.

    • HumaniusEnglish
      9•7 months ago

      The problem is not that it gives a download prompt, but rather that it tosses the PDF file into your downloads folder unrequested.
      It opens the PDF in the internal PDF viewer as well, but that is not the thing people are having issues with.

      • ares35
        -1•7 months ago

        NONE of the files i tested it on triggered the download prompt, populated the download status of the browser, or appeared in my default downloads location during their ‘viewing’ or after.

        • HumaniusEnglish
          6•7 months ago

          Great that it seems to work for you, but I’ve been experiencing this bug for months now if not longer.
          I made the changes OP suggested, and now it seems to work correctly.