PDF Studio is a comprehensive PDF editing tool with advanced features suitable for professional use, while Firefox PDF Viewer (PDF.js) is a lightweight, free solution for basic PDF viewing and annotations, primarily suited for casual users.
Firefox PDF Viewer (PDF.js)
Pros:
Free and open source
Lightweight and fast
Integrated into Firefox browser
Good for basic viewing and annotations
Cross-platform compatibility
Cons:
Limited editing features
Dependent on browser for functionality
Might lack some advanced features found in dedicated PDF tools