We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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.

In-built PDF viewer has suddenly stopped working.

  • 2 replies
  • 1 has this problem
  • 8 views
  • Last reply by cor-el

Drashya
Drashya
more options

I have long been using the in-built PDF reader of Firefox on my Windows 7 64-bit laptop. But since yesterday, whenever I try to open a PDF file, instead of the opening the file, the browser just pops-up the dialog box asking me whether to open the file or save it. And it keeps going on and on.

Once I checked the "Do this automatically for files like this from now on" check box and chose the option of "Open with.. Firefox", and the browser went into indefinite loop of opening new tabs and showing me the same dialog box again and again.

Anyone knows how I can fix this?

I have long been using the in-built PDF reader of Firefox on my Windows 7 64-bit laptop. But since yesterday, whenever I try to open a PDF file, instead of the opening the file, the browser just pops-up the dialog box asking me whether to open the file or save it. And it keeps going on and on. Once I checked the "Do this automatically for files like this from now on" check box and chose the option of "Open with.. Firefox", and the browser went into indefinite loop of opening new tabs and showing me the same dialog box again and again. Anyone knows how I can fix this?

All Replies (2)

Mijanur Rahman Rayhan
Mijanur Rahman Rayhan
more options

Firefox uses its own pdf viewer by default. Please read this article. https://support.mozilla.org/en-US/kb/view-pdf-files-firefox-without-downloading-them#w_using-a-pdf-reader-plugin

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You can check the pdfjs.disabled pref on the about:config page to see if it is still false. See also plugin.disable_full_page_plugin_for_types

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

Try to rename/remove the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.

You can use this button to go to the current Firefox profile folder: