Rated 5 out of 5 stars

Very good extension that has made a great leap on 2.0alpha. However the use of Conversation view disables addons that change the header (like Display Mail User Agent and Display Conctact Photo).
Could be interesting to work correctly with them (the display contact photo could be used to put the photo on the current avatar pic).
All the best

This review is for a previous version of the add-on (2.0alpha2).