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Showing content from https://support.mozilla.org/en-US/kb/disable-built-pdf-viewer-and-use-another-viewer below:

View and edit PDF files using Firefox’s built-in viewer

Firefox includes a built-in PDF viewer that lets you view and edit PDF files directly in your browser. This article will show you how to use the built-in PDF viewer and how to resolve common issues.

To learn how to switch to another PDF viewer, see Choose your preferred PDF viewer in Firefox.

Use Firefox’s built-in PDF Viewer

Firefox’s built-in PDF viewer allows you to view almost all PDF files found on the web without needing an external application (exceptions include PDF files with an incorrectly set MIME type). The built-in viewer is automatically used when PDF files are set to in your Firefox settings for different types of files, which is the default setting. When you click a link to a PDF file or open it from the Firefox Downloads panel, it will open with the built-in PDF viewer.

The PDF file will open directly in Firefox without being saved. To save the PDF to your computer, click the Save button in the PDF viewer’s toolbar.

Fill out forms in PDF Viewer

Some PDF files have interactive fields to fill in data (such as on forms). Using Firefox's built-in PDF viewer, you can fill out fields such as text, check boxes and radio buttons. After entering data into these fields, you can download the file to have the filled-out version saved to your computer.

Edit PDF files

Editing a PDF allows you to add notes, highlights and other markings directly on the document. This is especially useful for making corrections, highlighting important information, or adding personal notes for future reference.

Add an image to PDF files

In many PDF-related tasks, incorporating images can provide supplementary information to your content.

Insert an image

On the top right of the PDF page, click the Add or edit images button.
Click . This will prompt the file selection window.
Browse and select the desired image file to add it to the PDF.

Reposition and resize the image

Drag and drop the image to your preferred location within the PDF.
To adjust the image size, click and drag its borders until it fits your desired dimensions.

Add Alt Text for accessibility

After adding the image, click the + Alt text button.
In the provided space, either:
- Write a concise description of the image for screen readers, or
- Mark the image as decorative if it’s only for visual appeal.
Click the Save button to insert the alt text.

See Add alt text to images in your PDFs using Firefox to learn everything about Alt Text.

Add a signature to a PDF

This feature is experimental and is being introduced to the Firefox user base through a progressive rollout. It may not yet be available to all users.

Warning: Signatures added using the Firefox PDF viewer are not legally binding e-signatures. They are simple annotations and do not provide authentication or verification.

Firefox allows you to add your signature to a PDF document.

Open the desired PDF in Firefox.
In the top right corner of the page, click the Add signature button and then click + Add New Signature.
Choose between Type, Draw or Image, and click the Add button to insert the signature to the document. To re-do the signature before adding, you can select the Clear signature option.
- A. Type: use your keyboard to write down your signature.
- B. Draw: handwrite your signature using your mouse, or use your finger or a stylus pen on a touch-screen device.
- C. Image: insert an image or picture with your signature to the document.
- D. Descriptive alt text will be added automatically, but you can edit this at any time. The description will also be used as the name of your saved signature.

If the Save signature box is checked, your signature will be saved for re-use in the menu. You can remove it or add new signatures to PDFs at your convenience.

PDF Viewer keyboard shortcuts Command Shortcut Next page N or J or → Previous page P or K or ← Zoom in Ctrl + +Command + + Zoom out Ctrl + −Command + − Automatic Zoom Ctrl + 0Command + 0 Rotate the document clockwise R Rotate counterclockwise Shift + R Switch to Presentation Mode Ctrl + Alt + PCommand + Alt + P Choose Text Selection Tool S Choose Hand Tool H Focus the Page Number input box Ctrl + Alt + GCommand + Alt + G Troubleshoot problems with the PDF viewer

With certain types of PDF files, the PDF Viewer may have problems displaying fonts, colors or the whole document. If some PDF files don't render well or are blank, click the download button on the right side of the document header to open it with the default PDF viewer application on your computer.
If you can't open any PDF files with the built-in PDF viewer, a Firefox extension could be the cause. You can disable all of your extensions, to see if one of them was the problem. For details, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

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