This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How to force Firefox to download a PDF file when serving from a C# server code?

  • 4 replies
  • 1 has this problem
  • 11 views
  • Last reply by cor-el

more options

Firefox is opening the PDF within the browser after generating the file. I am using C# and in the response header I use application/octet-stream and I am using attachment. Thank you,

Firefox is opening the PDF within the browser after generating the file. I am using C# and in the response header I use application/octet-stream and I am using attachment. Thank you,

All Replies (4)

more options

Hi alanderos, The preference is stored in the Firefox profile. It can be changed in the Applications section of the Preferences menu. As for programmatically, I might suggest trying stackoverflow: *Where to go for developer support

more options

What happens when you click this link:

http://www.jeffersonscher.com/res/getpdf.php?f=Mixed_Content_Blocking.pdf

That is served with:

Content-Type: application/pdf Content-Disposition: attachment; filename=Mixed_Content_Blocking.pdf

See: https://support.mozilla.org/questions/971296#answer-479623

more options

Oops, I don't know anything about C#. Stack Overflow or Microsoft's forums would be a good choice.

more options

What does Tools > Page Info > General show when this file is opened in a tab?

When the server sends a file as application/octet-stream then this should make Firefox show the download dialog.