Thunderbird add-on CompactHeader
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Thunderbird extension to add a symbol in the 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.


Thunderbird does not anymore have the ability to reduce the display size of header pane to one line (as in Thunderbird 2.0). This add-on adds a symbol to compact and expand the message header plane. The compact header view mode can be set to either one or two lines.

A customization dialog can be opened for the toolbar in the header pane (right mouse button context menu) to change the displayed buttons and their style.

The shortcut "SHIFT+h" can be used to toggle between expanded and compact header view.

This add-on integrates the functionality of "RSS Linkify Subject" by Alex Dedul.

There is also an option to display only the email addresses in the compact header view. Another option enables darkening the message header, if the message pane has focus.

If you want to use the latest version, look for it at the beta channel at AMO.

Known bugs

There are several bug reports about a disappearing header pane in the compact header view mode. I could reproduce it if the TB Header Tools Extension is installed at the same time, see (


Downloading the installation file from and then install CompactHeader within the add-on manager of Thunderbird.


Please send support questions to the support threat at mozillazine.

Build the xpi

Download xmltask.jar from and add the jar to CLASSPATH. Then:

ant buildAMO

Running the tests

In the directory test a Python script is included which tests the add-on with different Thunderbird versions (see also .travis.yml and appveyor.yml using the Thunderbird infrastructure for mozmill.


Available options:

--version Version of Thunderbird to use for tests (currently supported ESR and nightly)

--nodownload Do not download the latest version of Thunderbird but use the one stored from the last test

--downloadonly Only download the latest version of Thunderbird but do not execute the tests


We use mozilla Toolkit version format for versioning. For the versions available, see the tags on this repository, versions available from AMO and the first message in the support threat.


See the list of contributors and tranlators in install.rdf who participated in this project.


This project is licensed under MPL 1.1/GPL 2.0/LGPL 2.1