How to increase the font-size in Thunderbird Mail

How to increase the font-size in Thunderbird Mail

As an dedicated Linux user I am using Mozilla Thunderbird as mail client. In this contribution I explain how you can increase the font-size of the mail list with use of CSS

As an dedicated Linux user I am using Mozilla Thunderbird as mail client, but since I have my mail on my laptop as an extra display I have hard time reading it from a distance, since I am doing the main work on my external display.

The only thing I needed is an increase of the font size of the list of mails. In this short contribution I will tell you the quickest way to get it done.

Step 1. go to your profile

In the ~/.thunderbird folder you will find a file named profiles.ini. Open that file and see what profile folder you need. It looks something like dekz1s3k.default-release, but then with your own prefix.

Step 2. create the required css

  • When in the ~/.thunderbird folder no folder exists named chrome, create this folder.
  • Create a file in the chrome folder named userChrome.css and enter the following contents:

/*
 * Do not remove the @namespace line -- it's required for correct functioning
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

/*
 * Make all the default font sizes 20 pt:
 */
* {
font-size: 20px !important
}

Save this file and restart Thunderbird Mail. You can modify the font-size to your own taste. But after every modification don't forget to restart Thunderbird.

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