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

Firefox .html files instead of existing .pdf files

  • 1 cavab
  • 1 has this problem
  • 3 views
  • Last reply by TyDraniu

more options

I looked at a previous thread on this - back in 2014, so I hope someone has an answer now. After downloading Firefox (for privacy reasons) all my existing .pdf files became Firefox .html files. Including .pdfs that I myself created by scanning documents. I have now been into the firefox preferences to ensure (I hope) that .pdfs are opened using Acrobat in future. But how do I get my existing files turned back? At the moment I feel very much like Joe (last thread in 2014) - Firefox should warn of this before downloading. One does not expect a Browser to change existing file types.

I looked at a previous thread on this - back in 2014, so I hope someone has an answer now. After downloading Firefox (for privacy reasons) all my existing .pdf files became Firefox .html files. Including .pdfs that I myself created by scanning documents. I have now been into the firefox preferences to ensure (I hope) that .pdfs are opened using Acrobat in future. But how do I get my existing files turned back? At the moment I feel very much like Joe (last thread in 2014) - Firefox should warn of this before downloading. One does not expect a Browser to change existing file types.

Chosen solution

Hi, I understand, that the icon and the filetype description has been unexpectedly changed to "Firefox HTML document", but it's still the same PDF. Just set the default pdf reader back to Acrobat and everything will back to normal.

Read this answer in context 👍 0

All Replies (1)

more options

Seçilmiş Həll

Hi, I understand, that the icon and the filetype description has been unexpectedly changed to "Firefox HTML document", but it's still the same PDF. Just set the default pdf reader back to Acrobat and everything will back to normal.