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  • Detailed Guide to Edit PDF in Firefox: Step-by-Step [With Pro Tip]

Detailed Guide to Edit PDF in Firefox: Step-by-Step [With Pro Tip]

  • By Charlotte
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  • Updated on September 28, 2025
Introduction:
Mozilla Firefox is a well-known web browser that is preferred for its high performance and enhanced speed. The efficient browser is known to provide the best customized features for its users, and hence, it is preferred worldwide for day-to-day operations. Users can now rely on this advanced browser to edit a PDF in Firefox. There is no need to download bulky software. The fantastic Firefox browser offers a PDF viewer and editor that lets you view, annotate, and edit PDFs. As a bonus, you can rely on a desktop PDF application to edit documents offline. 
summary

For Windows

For Mac:

Can You Edit a PDF in Firefox?

Edit PDFs in Firefox

Firefox provides a fantastic interface with other essential capabilities to facilitate users' ease. Even though Mozilla Firefox does not support a full-fledged PDF editor like Adobe Acrobat, it offers all the basic editing capabilities to edit PDF files offline. Firefox has a built-in PDF editor that can efficiently let you draw freehand and add text to a PDF. The editor can also help fill out forms in PDF format. 

Users may rely on the Firefox PDF editor to open, view, and make basic edits and annotations. Specifically, you can highlight and insert text, add and edit images, and draw lines. Besides, the editor also allows users to separate PDF pages by printing. It just works like an advanced PDF editor that can merge and split PDF pages. Check the detailed steps below if you wish to know how to use the Firefox PDF editor and a Firefox extension to edit PDFs.

How to Edit a PDF in Firefox: Detailed Steps

Downloading heavy PDF editors to add text requires effort and time. Perform basic editing with the existing Firefox PDF editor. The Mozilla Firefox PDF editor is a built-in tool to view and annotate PDF files on the browser. The Mozilla Firefox PDF editor is free to use and allows you to edit PDF documents. Use the built-in PDF editor to annotate and edit PDF documents easily. Let's learn how to edit a PDF in Firefox.

Step-by-Step Process to Edit PDF Using Firefox PDF Editor

Step 1: Open PDF in Firefox

Install the latest version of Firefox and open the browser. Now select the required PDF file in File Explorer, click it to select Open with, and choose the browser. You can also drag and drop the PDF into the browser to open it. 

Step 2: Access the PDF Editing Options

Go to the top right corner of the browser to access the Firefox PDF editing tools, such as text adding, line drawing, image inserting, and highlighting tools.

Edit PDF in FireFox 1

Step 3: Edit PDF in Firefox

Choose varied features from the editing option bar to annotate, edit, or create text and drawings using the toolbar. Users may carry out varied edits to the existing files. Let's discuss how to use Firefox to edit the PDF. 

Add Text to PDF

The built-in tool helps add text to existing PDFs by clicking on the Text Editor in the text-adding tool. Users may choose the color and text size to add a customized text box to any PDF document on the browser. You may adjust the text as you wish.

Edit PDF in Firefox 2

Insert Image into PDF

Choose the Image option in the toolbox to easily add images to PDF documents. Users can choose the desired size and placement for the added image. Click on the photo to add the image description to the Alt text. 

Edit PDF in Firefox 3

Further Edit the PDF with Firefox

The PDF editor also supports annotation tools to make reading a fantastic experience. Use the highlight feature of the built-in editor to mark a dedicated text in a PDF document or use the drawing tool to add a drawing to a PDF. The editor helps add the required thickness, opacity, and color to the drawings. Users may also add signatures to documents to add a personal touch.

Step 6: Save the Modified PDF File

Once all the settings are done, click the Save option to save the final PDF file.

Firefox PDF Editor Extension to Edit PDF

Are you looking for a better alternative method to edit a PDF in Firefox? Choose the advanced PDF editor online by officeonlinesystems. The easy-to-use Firefox PDF editor extension provides numerous features to handle PDF documents online. The add-on supports annotating tools to create, add, and save comments. It allows easy navigation to scroll within the document. The PDF reader extension is a free and open-source extension.

Step-by-Step Process to Edit PDF Using Firefox PDF Editor Extension

Check out an easy guide on how to edit a PDF file in the Mozilla Firefox browser using the Firefox PDF Editor Extension.

Step 1: Download and add the "PDF editor online" extension by officeonlinesystems to your browser.

Step 2: Click the Extensions icon to choose the extension and upload the desired PDF file.

Edit PDF in Firefox 5

Step 3: Upload the PDF to be edited, and choose the editing tools on the top bar to start your editing work.

Edit PDF in Firefox 6

Step 4: Format the text and markups to edit the PDF on Firefox with the Firefox plugin, and when you finish, click Save.

Bonus: Best Firefox Editor Alternative to Edit Everything in Your PDF

Bonus: Best Firefox Editor Alternative to Edit Everything in Your PDF

You can edit a PDF in Firefox PDF editor or select a valid Firefox PDF editor extension to enable PDF editing in Firefox. However, these tools only support an essential editing capability to annotate and edit PDFs online. Users must thus rely on a powerful PDF editor to enable advanced editing features.

SwifDoo PDF is an advanced PDF editor that helps change existing text in a PDF and place extra elements over the pages in seconds. The powerful tools offer varied features to add text, images, comments, backgrounds, hyperlinks, signatures, and forms to PDFs. The PDF editor is dedicated to handling scanned documents with OCR capability. The editor also offers an integration with AI assistance to easily convert and summarize PDF documents efficiently. The powerful tool also allows merging, splitting, and compressing PDF documents.

For Mac:

Step-by-Step Process to Edit a PDF using the Firefox alternative. 

Check out the easy steps to edit PDFs using the Firefox PDF editor alternative:

Step 1:  Install SwifDoo PDF

Find and download the SwifDoo PDF editor.

Step 2: Import a PDF

Launch SwifDoo PDF and choose Open to add a desirable PDF file to edit.

Step 3: Edit a PDF

Click Edit and choose the Edit All option to edit and annotate the opened PDF file.

Step 4: Save the PDF

Once all the editing has been done, click Save.

SwifDoo PDF is a trustworthy tool that surpasses the PDF editor for Firefox in terms of features, capabilities, interface, and ease of use. Check out some of the interesting features here: 

  • It helps view, edit, and annotate complete PDF or dedicated PDF content
  • Offers capabilities to organize and arrange pages
  • It lets you translate documents into stable languages
  • Let you summarize a PDF using an AI PDF summarizer
  • Support password protection to safeguard PDFs
  • It enables you to highlight and markup text for enhanced reading

For Windows

For Mac:

Conclusion

The article explains a straightforward guide on how to use the Firefox PDF editor to add and edit PDF text and insert images. Users may use the built-in Firefox PDF editor to edit PDF files in Firefox and its alternative software to enjoy editing capabilities online. However, the built-in tool and the extension support only a basic editing capability, and users must switch to other professional editors to enjoy advanced editing features. Choose the SwifDoo PDF editor to easily view, annotate, edit, merge, convert, compress, split, and share PDF files effortlessly.

Related FAQs

  • Q: Why is Edit PDF in Firefox not working?
    Firefox supports an in-built PDF editor that can annotate and edit PDFs online. However, sometimes users may face a Firefox PDF editor not working issue. There are several reasons for the problem. Check out possible issues and solutions:
    • Outdated versions: Only the latest Firefox version supports the PDF editor, so it is advised to switch to the latest Firefox browser to enjoy editing capabilities.
    • Unauthorized file permission: Some PDF files are created with read-only or view-only permissions that may hinder opening or editing. Choose to convert the PDF file first before choosing the editing option.
    • PDF viewer issue: Some PDF formats, colors, and fonts are not supported by online PDF viewers. Try to open such files on your PC before uploading them for editing using the Firefox PDF editor.
  • Q: How do I edit a PDF in a browser?
    Firefox allows for PDF editing, like adding text, images, and highlights. You can make additional edits on your PDF using the browser's native features. You can also edit a PDF in Edge, such as adding comments, typing text, and drawing on the PDF. Browsers cannot edit existing content.
  • Q: Does Firefox have a built-in PDF viewer?
    The Mozilla Firefox browser comes with a PDF viewer that allows you to highlight text and add extra text without third-party apps. You can change the default PDF viewer to make Firefox your primary PDF viewer.
  • Q: Why does Firefox not show PDFs?
    If your Firefox doesn't display your PDF or shows it not correctly, try updating Firefox to the latest version. If it is still not working, the cause may be the PDF renderer issue, and you can install PDF reader extensions.

Charlotte has been in the software industry for 8+ years. She works for AWZWARE now as a passionate writer. She is good at providing simple guides to use various video, office and entertainment software. Charlotte also recommends many other useful tools to make your work and life easier. A food lover too.

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