Summary

feedly に Chrome Extension の RSS Subscription Extension で RSS feed を登録したい。

以下URLでRSS feedが登録できる。
http://cloud.feedly.com/#subscription%2Ffeed%2F/[RSS feed URL]

RSS Subscription Extension なら以下の記述

http://cloud.feedly.com/#subscription%2Ffeed%2F/%s

Reference

How to add news feeds to your feedly – Customer Feedback & Knowledge Base for Feedly
http://feedly.uservoice.com/knowledgebase/articles/187494-how-to-add-news-feeds-to-your-feedly

RSS Subscription Extension (by Google)
https://chrome.google.com/webstore/detail/rss-subscription-extensio/nlbjncdgjeocebhnmkbbbdekmmmcbfjd