Today Mozilla released an update to The Firefox 78.0 Beta. This update is not very large, the biggest change is to download the PDF file after the can be opened directly in the Firefox browser reading. Starting with Firefox 78, the browser’s built-in PDF reader (PDF.js) can be set as the default PDF reader on Windows.
Like Chrome and Microsoft Edge, Mozilla Firefox has a built-in PDF browser where you can read PDF files. When you install Edge or other Chromium-based browsers (such as Vivaldi, Opera, and Brave), they can all serve as the default PDF readers on Windows systems. However, in the Firefox browser, reading most PDF files is not supported without installing a plug-in.
However, this issue is addressed in the latest Firefox installation. The installer can register supported default file associations on Windows. If you want to use Firefox as your default PDF reader in your Windows 10 system, here’s how
1. Make sure you’re running Firefox 78 or later, click Start, Settings, “App” and “Default App.”
2. Scroll down and select “Select default application by file type”
3. Scroll down to find .pdf and click on the current default program icon.
4. In the “Select Apps” dialog box, select Firefox
5. Open any PDF file on your device and it will now open in the Firefox browser.
Currently, The PDF reader of Firefox browser offers features including:
Support for printing
Allow users to download PDF files and save them locally
Provide synod or full-screen mode
Display thumbnails, index edits, or attachments of PDF documents in the sidebar
The minimum system configuration for Linux has also been adjusted, requiring GNU libc 2.17, libstdc? For developers, a new RegExp engine has been introduced in SpiderMonkey, with support for dotAll Flag, Unicode escape sequences, lookbehind references, and naming captures.