It would great to show what is new and what has already been looked at. There should be a mechanism to remove those articles that have already been reviewed, similar to what happens in Feedly.
The other useful feature would be to open links to article in the same tab and not force a new focused tab.
This could be implemented by adding the right click > customise toolbar option that is/used to be standard for mac apps. Which would incidentally solve many other suggestions like the rearranging of plugins and resizing of the location bar.