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

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

"Only [PDF] format is allowed" how to resolve this problem we facing every pdf upload

more options

Hello Sir/Madam

here we facing the PDF files uploading problems.

i am the employee in GWMC office. Here we daily upload the 100's of PDF files by using our website in firefox browser only. but recently we facing the one problem i.e., "Only [PDF] format is allowed" . so please tell me the solution because in my office so many files are pending.

Thanks & Regards Naresh

Hello Sir/Madam here we facing the PDF files uploading problems. i am the employee in GWMC office. Here we daily upload the 100's of PDF files by using our website in firefox browser only. but recently we facing the one problem i.e., "Only [PDF] format is allowed" . so please tell me the solution because in my office so many files are pending. Thanks & Regards Naresh

All Replies (1)

more options

Sometimes Firefox will send an incorrect content type with a PDF, such as "application/download" instead of "application/pdf". You can rename or delete the settings file that stores these associations and have Firefox regenerate it. Here's how:

Open your current Firefox settings (AKA Firefox profile) folder using either

  • "3-bar" menu button > "?" button > Troubleshooting Information
  • (menu bar) Help > Troubleshooting Information
  • type or paste about:support in the address bar and press Enter

In the first table on the page, click the "Show Folder" button. This should launch a new window listing various files and folders in Windows Explorer.

Leaving that window open, switch back to Firefox and Exit, either:

  • "3-bar" menu button > "power" button
  • (menu bar) File > Exit

Pause while Firefox finishes its cleanup, then rename mimeTypes.rdf to something like mimeTypes.old

Restart Firefox and content association should return to defaults.

Note: Your PDF preference likely will be reset to the internal PDF viewer, but you can switch it to the Adobe plugin as described in this article: View PDF files using Firefox’s built-in viewer.

Any improvement?