The standard email header in the mail client Thunderbird 3 spans across three rows. It displays information such as the the sender’s email, the subject, email recipient and toolbar buttons to quickly reply, forward, delete or tag the email. The email header can be expanded to display all email header information which are important if the technical details of the email need to be analyzed further. There is on the other hand no option to compact the header in Thunderbird to save space.
Most Thunderbird users probably do not need some of the information and options provided by default. This includes for example the information to whom the email was send or the action buttons like deleting emails which are also available on a right-click in the email itself.
That’s where the experimental add-on Compact Headers comes into play. The add-on is compatible with Thunderbird 3 only and can reduce the size of the email header to one row.
Thunderbird 3 Default Email Header:

Thunderbird 3 Compact Email Header:
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The way the email header is displayed in compact form can be altered in the add-on’s options. It is possible to increase the size to two rows which can also hold some of the buttons that are provided in the standard Thunderbird header. Buttons can be individually selected in the options.
Compact Header for Mozilla Thunderbird 3 is an experimental add-on that is not automatically updating itself. The add-on comes with a “check for updates” button in the options. It is available at the Mozilla Thunderbird add-on repository at Mozilla.org.
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The new header space in Thunderbird 3.0 is hideous, awfull… !
It is nearly as bad as in the Ubuntu Evolution email, which I threw out as fast as I found it can not be modified.
This header space must be built by someone with 4000×3000 pixel screen. Should have tested it in a mini laptop too !
Yes, most information is not necessary and/or already shown in the message display.
Thank you so much for this add-on! My laptop has limited resolution and the new buttons take up valuable reading space.
Ludicrous abuse of space – well done whoever wrote the cure.
The header merely duplicates the info in the email list, and adds buttons – which would be just as well in the menu bar.
I’m using a 17″ monitor, and I lose 40% of my screen height to non-message UI elements.
40% !
Where is the download?
The download is linked in the last sentence.