Sage (RSS Add-on for Firefox) is described as 'Sage is a lightweight RSS and Atom feed aggregator extension for Mozilla Firefox. It's got a lot of what you need and not much of what you don't' and is a RSS Reader in the news & books category. There are more than 100 alternatives to Sage (RSS Add-on for Firefox) for a variety of platforms, including Web-based, Android, Windows, Mac and iPhone apps. The best Sage (RSS Add-on for Firefox) alternative is Feedly, which is free. Other great apps like Sage (RSS Add-on for Firefox) are Inoreader, Feeder RSS feed reader, Fluent Reader and RSS Guard.
Experience a magazine-like RSS feed with seamless integration across devices, quick-loading cards, and effortless sharing across social platforms and other apps.
Aggregate feeds from RSS, social media, and newsletters with advanced filtering, OPML management, website monitoring, IFTTT automation, cloud syncing, text-to-speech, dark mode, and collaboration tools for flexible and efficient content consumption across devices.
Feeder is a fully free/libre feed reader. It supports all common feed formats, including JSONFeed. It doesn't track you. It doesn't require any setup. It doesn't even need you to create an account!
It is free for Mac, Windows and Linux if you download it from GitHub, and it's paid ($2) for Android and iOS.
RSS Guard is simple, light and easy-to-use RSS/ATOM feed aggregator developed using Qt framework which supports online feed synchronization.
Reeder is your all-in-one inbox for reading, watching and listening to content from various sources.
Fast & free RSS feed reader as a browser extension for Chrome, Vivaldi, Edge, Brave and Firefox for reading blogs, news or any RSS, Atom or RDF based feed.
RSS reader shows you articles from your favorite blogs and news sites, and it keeps track of what you’ve read.
Flipboard is a fast, beautiful way to flip through the news, photos and updates your friends are sharing on Facebook and Twitter.
NewsBlur is a personal news reader that brings people together to talk about the world. It shows you the original site and allows you to read stories directly off the site while keeping track of what you read. It also filters and highlights stories you like and dislike.
QuiteRSS is a open-source cross-platform RSS/Atom news feeds reader written on Qt/C++
Liferea is a web feed reader/news aggregator that brings together all of the content from your favorite subscriptions into a simple interface that makes it easy to organize and browse feeds.
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It's neither for Firefox nor a RSS reader