Firefox Community Forum

Hello all.

I chose "Use Adobe Acrobat Reader" for open PDF in settings and it works fine until I closed Firefox and open it again. The setting bounce to "Open in Firefox". Then, I tried choosing "Always Ask", closing Firefox and opening Firefox again. The setting preserved as "Always Ask" and did not bounce to "Open in Firefox".

I checked handler.json in user profile folder after I chose "Use Adobe Acrobat Reader" for PDF, action is 4: {"defaultHandlersVersion":{},"mimeTypes":{"application/pdf":{"action":4,"extensions":["pdf"],"handlers":[{"name":"AcroRd32.exe","path":"C:\\Program Files (x86)\\Adobe\\Acrobat Reader DC\\Reader\\AcroRd32.exe"}]}},"schemes":{}}

But then after restarting Firefox, it changed to 3: {"defaultHandlersVersion":{},"mimeTypes":{"application/pdf":{"action":3,"extensions":["pdf"],"handlers":[{"name":"AcroRd32.exe","path":"C:\\Program Files (x86)\\Adobe\\Acrobat Reader DC\\Reader\\AcroRd32.exe"}]}},"schemes":{}}

Checked handler.json with "Always ask". Before and after restarting Firefox, action is 1, which is expected and correct.

Some other colleagues reported the same issues as well. I am thinking if this is a bug from Firefox.

Some more notes here:

• The issue only happens to PDF, for other Content types, all good.
• Already disabled all plug-ins and extensions.
• Tried refreshing Firefox in safe mode
• Tried choosing another external PDF reader Foxit
• Firefox version is 140.0.2

Some screenshots are attached showing where it is.

Hope someone can help on it. Thanks in advance.

Hi Firefox Team,

Why suddenly today there's no PDF preview for all PDF file sent or received on browser (i.e whatsapp web) Attached latest screenshots

Please assist.

Regards, Novie

I received two work-related files, one in PDF format and one HTML, both of which display blank pages when opened in Firefox. I am able to open both files in Chrome with no problem. I've been using/opening similiar files on Firefox from the same source for many years with no problems, so this came up fairly recently. Please help.

After updating to newest Firefox 140.0.2 (64-bit) does all PDF attachment stop working it doesn't offer to save or open them as it used to, we tried sending a Doc document to the email and it will download them and open them so it is only PDF files.

I tried new profile with blank slate on her PC.

OS: Windows 11 Have Bit defender security and Malwarebytes

I also tried on my PC logging into the work email as neither me or wife use Apple and same problem PDF attachments will not open or work.

I didn't create a new blank profile on my PC.

My PC: Windows 10 Enterprise Have same Bit Defender security and Malwarebytes

It worked in 139.0.4 for her, but downgrading is not a option as if I read the downgrade page right it will make a new profile making her loose the profile she is using now.

Do anyone have any ideas why after the update does Firefox now not open PDF Attachments, we tried Edge and it work fine there, if she forward from the work email to her private which is a gmail account she can open the PDF files, but that is not a good way of doing things or acceptable as it is work emails sent from companies her boss work with, he is a car mechanic with his own mechanic business.

Please tell me what details you need from me to help her find out why it stopped working or anything else I can try.

The Work place is just her and her boss plus 1 employee so I help with the IT on the work computer so I need to find out why this update stopped PDF attachments from working.

Hi : I have a website that, except for its Index page, is made up entirely of .PDFs. These .PDFs are created from MS Word documents. I noticed that when viewing the site in Firefox, the author of the .PDF pages in the tabs was given as : Microsoft Word [filename]. Accordingly, I made sure the Word files had my name hardcoded into the Info section so that it would be same for all documents I created. I then changed the metadata of the .PDF files to include my name as author and the title of the file. However, 'Microsoft Word [filename]' still appeared in the Firefox tabs. I have no idea where Firefox is getting this information from. Curiously, when I look at my website on Microsoft's Edge browser, the tabs have the correct information : 'Patrick Kearney [filename]'. Any help making Firefox behave in the same way would be much appreciated. I have no desire to switch my browser to Edge or anything else. Thanks in advance.

Recently, I am unable to open PDF's on Firefox. When I go to another browser and access the same site (such as a bank) I am able to view the PDF. I have tried some of the suggestions regarding extensions etc, but nothing seems to work. Is there a solution? Thanks, SVS

Firefox screws up showing .pdfs. The first view is fine but scrolling seems to overprint the first view without erasing it, if that makes sense, sorta like a double exposure. I can't get a screen cap either, which might just mean it's not a firefox issue at all, but I can view and screen cap .pdfs from any other application. I'm running Debian 12 up to date. When I need to view a .pdf I use Chromium, but I do prefer Firefox.

I've spent a decent amt of time filling this out only to learn the data won't save nor print and this is absolutely stupid AF! I downloaded it with FF and had no idea to think it would not save nor print the text fields! Acrobat doesn't load any data as well. This is really a fing nightmare!

Dear Firefox Support Team,

I am encountering an issue where PDF files fail to display properly in Firefox, appearing as blank pages. This problem persists across multiple PDF documents, suggesting a potential browser compatibility or configuration issue.

Request: Please investigate this behavior to identify the root cause (e.g., rendering engine, plugin settings, or recent updates). Adjust Firefox’s default PDF handling settings or implement necessary fixes to ensure proper PDF display.

Additional Details:

• Firefox Version: All
• OS: Windows & Mac
• File link: https://res.mdpi.com/data/pharmaceuticals-18-00847-v4.pdf
• Steps to Reproduce: Open any PDF file → Blank page appears.

This issue impacts productivity and user experience. Kindly prioritize resolving it or provide workarounds. Thank you for your attention.

Best regards, Mia Yu [email removed]@mdpi.com/[email hidden]@qq.com

Hi!! I´m writing a whitepaper and need to link to some PDF files but the address I get, for instance, is "file:///C:/Users/ritas/Desktop/NAC-DGERCGC18-00000233-4.pdf". Of course I cannot direct readers to my desktop. I´ve been trying for too long to fix this, please help. I need to be able to link to the document in the correspondent website.

Thanks

Rita

Lately, whenever I try to open a PDF from a website open in Firefox, the tab crashes and the PDF does not open. An error stating that the Windows file-dialog has crashed is displayed at the top of the tab. I tried to attach a screenshot of the error but that action only generates another error.

This condition does not occur when I try to open the same PDF from the same website open in either Chrome or Edge, the PDF opens properly which leads me to believe the problem is in Firefox and not my Adobe installation.

Thank you

Firefox 138.0.1, MacOS Monterey 12.3

PDF files: settings is set to "Always ask" (see attached) However, when I click on a PDF link, and get the dialog "Open With" is grayed out, and the only option available is "Save File" (see attached screenshot). (A few weeks or months ago it all worked correctly.)

Is there a way to get "Open" working again?

I want to edit a PDF with firefox. The PDF has two different address lines. When I put in one address it automatically copies it into the other line. But I the two addresses I have to put in are different. But when I edit one the other does the same. What can I do?

The A4 print preview (and the printout itself) from the PDF file is shrunken. I've tried printing from Edge and everything works normally there, so it's a Firefox problem. How do I fix it?

Every document like the below one does not display in firefox esr 115:

https://support.hpe.com/hpesc/public/docDisplay?docId=c01081836&docLocale=en_US

I get an empty pdf viewer frame. Also the debugger shows the following error;

Uncaught TypeError: Promise.withResolvers is not a function

Is there some way to overcome this problem? a future release of firefox esr?