Firefox Community Forum

Hello Mozilla Support Team,

I have been using Firefox for a long time, and recently I upgraded my Windows system. Before the upgrade, I had set Firefox to open PDFs directly in a PDF Reader other than Firefox’s built-in PDF viewer, and it worked perfectly. However, after the upgrade, Firefox now shows the "Opening when completed" message and opens PDFs slowly, instead of opening them immediately in my chosen PDF Reader.

I have checked the settings, cleared the cache, refreshed Firefox, and even tested with other software, but the issue persists. The settings for handling PDFs are still the same, but they don't seem to work as they used to.

Can you please assist me in resolving this issue? Any help would be much appreciated.

Thank you

When viewing a PDF, I selected some text, right clicked and chose the "Highlight Selection". The selected text was not highlighted. Instead, the "highlight" button on the top right corner pop up and the freehand highlight was triggered, while all my previous selection was lost.

I image this was not the intention of the "highlight selection", and I was also wondering if there is a shortcut for highlighting text in pdf.

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

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?

When printing a PDF with custom page ranges, the footer text in the print preview (see image) does not match the actual page. As shown in the example image, if I want to print pages 2-16, the preview indicating page 4 is actually page 5.

So, if I want to print with a very custom range, such as 2-4, 6-10, 12-14, 16, it will be very confusing and will take longer to adjust.

And I also print custom ranges like this very often for daily tasks. I’m not sure if this is a bug or just a minor adjustment needed in Firefox’s coding. Thank you in advance for your help.

Firefox 137.0.2 64 bit

I've recently set up on a new desktop running windows 11.

My previous setup had windows 10, but the same version of Firefox.

In the past, when building web pages in php, I'd always used Firefox to preview the html elements of pages offline. I've not used a testing server on Windows as I'd rather test the PHP elements on the live server. Firefox was just for testing the html / css design elements, which it worked very well for.

Now, on my new computer and windows 11, when I try to open a php page offline with Firefox I get a window asking me what to do with the file - "open with" or "save file". When I choose "open with" and choose Firefox, Firefox opens up another tab with the address of the file in the address bar, but no content below, and then another window pops up asking me what I want to do with the file. This goes on indeffinately if I keep clicking "open with". There's no issue with the files I'm trying to open as I can open the exact same files on my win 10 computer with the same Firefox version and the display just fine. What's going on?

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

Hello... currently when I try to open a PDF from the internet, I cannot open it in Firefox. Specifically I have been adding PDF files to a FB page, but cannot open the document when browsing in Firefox. I can open it, when using EDGE.

Your browser needs immediate attention! I have windows 11. When I visit websites via Firefox and click on a link that takes me to a document, a large pop-up on the lower right side of the screen appears blocking half the page and preventing me from downloading or printing it. The pop-up depicts a cartoon-letter with a highlighter pen traversing its cartoon-text, below which is an enthusiastic missive stating (and I quote): "Now you can highlight your PDFs! With our new highlighter tool, you can read and edit PDFs in one place." Because of this infernal nuisance, I cannot print or download web pages. This has been going on for WEEKS! (That pop-up is USEFUL?! Who thinx up this stuff??!!) Apparently you're having trouble fixing this problem ... I understand--I'll just use Edge or Chrome from now on. Sorry if I woke you.

Hi All,

I've set Firefox to open PDFs in the default system application (I'm on Linux, KDE, Firefox 146). With previous versions it worked fine. Now, it won't open the file; instead it shows a popup that I have to click to open the file.

Is there a setting I can tweak to get the old behavior back?

Thanks

GI

Hello,

I have a PDF that opens and displays correctly in Adobe as well as the Edge Browser.

However, when I attempt to open it in Firefox in Windows 11 it doesn't show the letter "i" - - - I swear I'm not making it up. I had a friend try to open it in her Firefox (Windows 10) the letter "i" is also missing.

I wish I could attach the actual PDF so others can test but I will add a screenshot to this message.

Regards,

Paul

For about a week now, I have been unable to read any pdf document I download. The body of the document is completely black (that is black, not blank). When I go to save the document, it is saved as a black (unreadable) document. I have had to switch to using another browser in order to be able to download/save a readable pdf document. How can I fix this issue?

Hello: recently I decided to ditch expensive PDF Converter apps for my desktop pc as overspecified for my purposes. To date, I haven't found any guidance to use the Firefox Easy PDF Converter - usually required to convert Lotus Word Pro or MS Word text documents to pdf format. As a second request, can it be used to reverse convert e.g. pdf to docx etc. I have already added it to my Firefox app, but can't go any further. Thank you for helping. Geoff Pickerell (UK)