A quick tip I worked out today. If you are using the excellent Minimal Reader for your RSS feeds and want to quickly subscribe using the RSS Subscription Extension in Chrome, go to the extensions options page and add a new feed reader using this as the URL.

https://minimalreader.com/settings/subscriptions/add?url=%s

Now when you use the extension to subscribe to a feed, it will take you to the add subscription page in Minimal with the URL already completed.