Hi,

Thank you the review and rating.

Moving a feed into an empty folder - You are right to wonder and there is a trick to this. If you press the shift key while dragging the feed over the folder, the folder will highlight and you can drop the feed into it.

Difficulty using keystrokes to mark items as read - For me keyboard shortcuts in a web extension are a mess because there are always conflicts with other extensions. I'll see what I can do in terms of adding some shortcuts for some context menu items.

A toolbar button for "Subscribe to Feed." - That's a good idea to implement. The "Discover Feeds" button (magnifying glass) in the Sage-Like sidebar provides a somewhat similar operation.