First seen in 2009, Toolbars & Bookmarks. This page records what the extension did, whether it is still available, and what to use instead.
What it was
Showed an icon in the address bar when the page offered an RSS feed and let you subscribe, a feature Chrome never built in. RSS Feed Reader and Feedbro are the current feed extensions.
Succeeded by RSS Feed Reader
The earlier extension is gone, but its role is filled today by RSS Feed Reader, with 500K users and a 4.1 rating. See its statistics and history.
Current alternatives
The most used extensions with "rss" in their name today.