Firefox Community Forum

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.