I like how you implemented our suggestions :)
You made it simple to switch between sources, and I like how clean the UI is.
Initially, I thought about each comment source being a separate extension. But I can see the value in integrating the sources into one. It makes it easier to get another perspective on a topic, without setting up too many things.
On the subject of getting different perspectives: Can you select the subreddits that provide you with the comments?
