This extension is capable of capturing and subscribing to only on those pages with the most obvious of feeds. I'd expect better from a quality service like Inoreader.
"Inoreader Companion" (v1.28) frequently fails to find and subscribe to many news sites, tumblr, etc. Surprisingly, it is outperformed by the competition's "Add to Feedly Plus" (v1.9), which often captures feeds which "Inoreader Companion" misses.
This Inoreader extension is still a time saver on some pages, which earns it three stars. If a subsequent revision of this extension improves the RSS capture/subscription performance, I'll be back to up the rating.