Rated 5 out of 5 stars

It was a shock to see that Thunderbird 38.1.0 no longer had the familiar minus button to hide most headers of a message. No idea how people can use Thunderbird without!

This extension restored the familiar behaviour of versions up to 37, allowing me not to abandon Thunderbird.

This review is for a previous version of the add-on (2.1.0).  This user has a previous review of this add-on.