In this guide, we will discover: How to Open and Edit PDFs in Firefox Computer browser – guide 2023
PDF files are a highly popular file format for sharing documents due to their platform-independent nature, which means they can be accessed on any device, regardless of the operating system.
Mozilla Firefox offers a convenient feature that allows users to open and edit PDF files directly within the browser. This feature includes the ability to save web pages as PDF files and open online PDF files directly in the browser, without the need to download them.
While the Firefox PDF Editor feature only supports annotations, such as adding text or drawings to existing PDF documents, it still proves to be useful for filling out registration forms or adding information to existing documents. This eliminates the need for printing, filling out forms by hand, scanning the pages, and converting them to PDFs, making the entire process much more efficient.
Furthermore, the edited PDF files can be saved and shared without worrying about losing any changes made to them.
Open PDF Files
The built-in PDF viewer in Firefox allows us to open PDF files. We do not need to install any add-on or extension to enable PDF reader support.
Here are the steps to open the PDF file in the Firefox browser:
- Launch the Firefox browser.
- Click on the File menu from the menubar.
- Select Open File and choose the desired PDF file from File Explorer.

- Click on Open button to view PDF in the Firefox browser.
Alternatively, you can drag and drop the PDF file in the Firefox browser window/tab to open in the built-in PDF viewer.
Editing PDF File
The Firefox PDF editor has a tools bar menu with editing options. You can click on these tools options and perform the actions like a pencil drawing and annotating text.
Here are the steps to edit a PDF file in the Firefox browser:
- Launch the Firefox computer browser.
- Drag and drop the PDF file to open the browser’s PDF viewer.
- Click on the Pencil icon from the toolbar in the browser window.

- Customize the Color, Thickness, and Opacity.
- Click on the Caret/Text Editor icon to insert text.

- Finally, hit the Save icon to store the edits in a separate PDF file.

The PDF file edited in Firefox will stay intact when launched in any other PDF reader. And it’s not necessary to open it again in the Firefox browser to view edits.

While there are a few existing Firefox add-ons, such as PDFescape, PDF2GO, and PDF Editor Online, that can help users edit PDF files, they typically require users to create an account before they can access their services. As a result, the built-in PDF editor within Firefox remains the most convenient and reliable option for most users.
Bottom Line: Firefox PDF Editor
The inclusion of a PDF reader and editor within Firefox has proved to be highly beneficial for users, as it allows for a quick and efficient way of filling out registration forms and adding information to documents, without the need for a manual paper-pen process.
Additionally, the ability to draw using the free-flow pencil icon enables users to add their signature to PDF documents, providing a convenient way of verifying their identity.
Although the Firefox PDF editor lacks the ability to remove existing content or images, it is still a valuable tool for adding and annotating text, as well as highlighting important sections within the document. It’s worth noting that a similar feature is already available in the Microsoft Edge browser.