Great add-on. Does just what I need and nothing more. I can see feeds and quickly subscribe to them using my preferred reader (Feedly).

A few minor suggestions if you're interested in adding anything:

1: The old Apple Safari RSS reader had a slider to let you decide how much content to show for each item, ranging from the subject only up to the full content. WMRSS always shows the full content. Maybe a configuration to let me choose to see subjects only or the subject + the first 3 or 5 lines of content.

2: A way to select the font and size

But these are very minor concerns since I usually just look at the feed long enough to subscribe to it