Email Account Colors For Thunderbird

Martin Brinkmann
Jan 6, 2012
Updated • Jun 26, 2017
Email, Thunderbird

Account Colors is a free extension for the Thunderbird email client that enables you to show accounts in different colors and font styles in Thunderbird.

If you have multiple email accounts set up in the desktop email client Thunderbird, you may notice that it is hard to near impossible to distinguish accounts on first glance.

The core reason for this is that there is no visual distinction between accounts. Everything is displayed in the exact same color scheme with no options to change it.

While account root folders may be displayed as email addresses, this is not necessarily the case all the time.

Account Colors

thunderbird email account colors

The Thunderbird add-on Account Colors changes this. The extensions allows to assign font and background colors to accounts or identities to visually distinguish them from other accounts set up in the email client.

The extension makes no modifications to the email client on its own. It is up to you to customize the program in the add-on options. Just click on Tools > Add-Ons and there on the options button next to the Account Colors entry.

Settings are displayed in five tabs in the interface that allow you to make modifications to the folder, thread and message pane, as well as the compose window.

account color options

Font styles and font sizes can be changed for different identifiers that are displayed in the email client. This includes account names in the folder pane, and subject names in message lists or message headers.

Font and background colors are taken from the account and identity colors tab. All colors are set to black and white by default, which you need to change during setup if you want to distinguish accounts from each other.

Other options include adding bolt to fonts, showing tree lines in the folder pane, row stripes in the thread pane or increasing the row spacing in the folder or thread pane.

The main purpose of the add-on is to improve the visibility of email accounts. Assigning colors to email accounts makes it a lot easier to identify those accounts on first glance.

Thunderbird users can download the Account Colors extension from the official Mozilla Thunderbird add-ons repository. The extension has been tested under the latest stable version of Thunderbird.


Account Colors is a handy extension for Thunderbird users who use multiple email accounts in the email client. It may be used to distinguish accounts to that it is easier to distinguish them.

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Account Colors
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  1. Dean said on January 8, 2012 at 1:10 am

    Thanks for this. Installed and very happy with it.

    Would never have thought to go looking for something like this; suppose it was a solution looking for a problem! haha

    1. Martin Brinkmann said on January 8, 2012 at 2:05 am

      It really improves visibility which is always nice when it comes to e-mail.

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