What are some alternatives?
ezLinkPreview - Browse more efficiently: Preview links and images without leaving your current tab.
Inoreader - Dive into your favorite content. The content reader for power users who want to save time.
Hover Zoom - Enlarge thumbnails on mouse over.
Feedly - The content you need to accelerate your research, marketing, and sales.
Thumbnail Zoom Plus - The official site of the Thumbnail Zoom Plus add-on for Firefox
Tiny Tiny RSS - Web-based news feed aggregator, designed to allow you to read news from any location, while feeling...