Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Message and News Reading
Add symbol in header plane to switch between compact and expanded view. Options to switch between one or two lines compact view, which buttons should be displayed in header pane. For Thunderbird 36 and older use version 2.0.9 (see version history)
This add-on is not compatible with your version of Thunderbird because of the following: