FeedHarbor Pro od Nguyễn Hùng Anh

Subscribe to multiple RSS feeds
Automatically fetch and update feeds in the background
Display feed items in a popup
Add and remove feeds
Refresh all feeds manually
Customizable update frequency
Limit the number of items stored per feed
Notifications for new items (optional)
Mark items as read when opened (optional)
Options page for customizing settings
Responsive design for the popup