Firefox PDF Viewer (PDF.js) vs Free Opener

A side-by-side look at Firefox PDF Viewer (PDF.js) and Free Opener. For an in-depth review of either product, follow the links below.

Firefox PDF Viewer (PDF.js)

Web Browsers

Firefox PDF Viewer (PDF.js) is an open source PDF viewer that is built into Firefox. It allows you to view PDFs directly in the browser without needing an external plugin.

open-sourcepdfviewerfirefoxbrowser-plugin

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Free Opener

Office & Productivity

Free Opener is a free, open-source file viewer and converter software for Windows. It allows you to view over 300 file formats such as documents, spreadsheets, presentations, images, and more. It also lets you convert between common file formats.

freeopensourcefile-viewerfile-converterdocumentsspreadsheetspresentationsimages

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