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To open PDFs in Firefox instead of downloading them or asking what to do, change the PDF file action to Open in Firefox. In Firefox, go to Menu → Settings → General, scroll to Applications (also labeled Files and applications in Mozilla help), find Portable Document Format (PDF), and choose Open in Firefox. Close Settings; the change is saved automatically.
Set Firefox to open PDFs in its built-in viewer
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Open the Firefox menu and select Settings.
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In the General panel, scroll to Applications or Files and applications.
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Find Portable Document Format (PDF) in the content-type list.
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Open its action menu and choose Open in Firefox. Mozilla identifies this choice as the one that displays the PDF in Firefox’s built-in viewer. The setting saves when you close Settings. Mozilla Support: View PDF files in Firefox or choose another viewer; Mozilla Support: Change what Firefox does when you click on or download a file.
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What the other PDF actions do
| PDF action | What happens | When it makes sense |
|---|---|---|
| Open in Firefox | Displays the PDF in Firefox’s built-in viewer. | Use this to read PDFs in the browser. |
| Always ask | Prompts you to choose whether to open the file in Firefox, open it with another PDF application, or save it. Opened PDFs are also saved to Downloads. | Choose this when you want to decide for each file. |
| Save File | Saves the PDF to Firefox’s selected download folder. | Choose this when you prefer to download PDFs for later. |
| Use the system default application | Opens the PDF with the application configured as the operating system’s default, when this option is available. Opened PDFs are also saved to Downloads. | Choose this to read PDFs outside Firefox. |
Option names and availability can vary by system. The PDF-specific action is separate from Firefox’s general Ask whether to open or save files setting, which applies to files with no defined content type. Mozilla cautions against choosing Firefox itself as a helper application to always open a file type, since that can lead to repeated empty tabs or windows. Mozilla Support: Change what Firefox does when you click on or download a file.
If Firefox still downloads or asks about a PDF
Check whether it happens with every PDF
First confirm that Portable Document Format (PDF) is set to Open in Firefox. Then test another known PDF link. Firefox’s built-in viewer handles almost all PDFs found on the web, but an incorrectly set MIME type can prevent a PDF from being handled as expected. How a particular site serves an individual link can also affect whether Firefox treats it as browser content or as a download; the setting alone cannot establish how that site sends the file. Mozilla Support: View PDF files in Firefox or choose another viewer.
Rank #2
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If only one site or link behaves differently
If other PDFs open in Firefox, the issue may be specific to that link or the way the site serves it. Avoid changing advanced preferences based only on one file; check with the site or use another PDF link to narrow down the problem.
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If the PDF opens but renders incorrectly
For a blank document or problems with fonts, colors, or the page as a whole, Mozilla recommends using the PDF viewer’s download button and opening the downloaded file with your computer’s default PDF application. Mozilla Support: Using the Firefox PDF Viewer.
Rank #3
- 【Android Tablet】Equipped with the latest Android system, it has stronger compatibility, faster response speed and smoother operation. It is GMS certified, pre-installed with Google Play, and supports social applications such as Facebook, Twitter, YouTube, and TikTok. It is very suitable for watching videos, online chatting, reading e-books, etc.
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If no PDFs open in Firefox
An extension may be interfering. Disable extensions and check whether PDFs then open in the built-in viewer. If they do, re-enable extensions individually to identify the one involved. Mozilla Support: Using the Firefox PDF Viewer.
Quick Recap
Best Value
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Rank #4
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