Rated 5 out of 5 stars
This is a great reader i do have some minor issues with it though they are as follows:
When using popup setting pressing the button once brings it up but pressing it again doesn't close it.
Should be able to adjust the width (in the settings menu) for the sidebar and content. As there is a lot of free space and it can be massive when using Firefox in windowed mode.
Also the mouse-over tooltip on feeds(content and list view) is quite far away from where your mouse looks a bit odd.