addons.mozilla.org
Sage-Like is a fast, lightweight sidebar-based feed reader extension for the Firefox browser. It supports Atom, RSS, JSON and RDF feeds, offers a customizable user interface, and integrates with Firefox bookmarks and sync functionality. It can discover feeds from the sidebar and address bar, including hidden RSS feeds on platforms such as YouTube, Reddit, DeviantArt, Pinterest and Behance, and has a customizable feed tree view.