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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Cannot open pdf files

  • 2 replies
  • 392 have this problem
  • 11 views
  • Last reply by Kirboid

AnonymousUser
AnonymousUser
more options

I tried to open a pdf file but cannt open it,. ..

Troubleshooting information

c:\program files\mozilla firefox\eula.exe

I tried to open a pdf file but cannt open it,. .. == Troubleshooting information == c:\program files\mozilla firefox\eula.exe

Chosen solution

Take a look at View PDF files using Firefox’s built-in viewer

Read this answer in context 👍 3

All Replies (2)

JYOuyang
JYOuyang
more options

Chosen Solution

Take a look at View PDF files using Firefox’s built-in viewer

Kirboid
Kirboid
more options

On my MacBookAir, this happened to me a few days ago. Working fine then BAM - pdf files would not open in Firefox. I went in to Firefox-> Preferences -> AddIns and saw it was set to use an Adobe Plugin NPAPI. I disabled this, then went to Preferences -> Applications and set the Preview application to Adobe Reader. That fixed it fore me.