Rated 5 out of 5 stars

Great addon! Visually, it would be nice if there was an option to remove the buttons (reply, forward, etc.) as well. Thank you very much for helping to reclaim what was wasted screen real estate!

This review is for a previous version of the add-on (1.1.4). 

You can do this with the customization dialog: Press the mouse button over the buttons. Then grab the buttons with the mouse and drop them over the customization dialog.