Changing the Default Mozilla Thunderbird Message Font

What to Know

  • Go to Menu > Account Settings > Composition & Addressing and make sure Compose messages in HTML format is checked.
  • Next, select Global Composing Preferences, choose General, then scroll down to Language & Appearance to adjust the font.
  • To change the font when composing a message, select Format > Font.

This article explains how to change the default font in Mozilla Thunderbird for composing new messages. The instructions below apply to Thunderbird for Windows, but the process is similar on Macs.

Change the Default Mozilla Thunderbird Message Font

To set your own default font for composing new messages in Mozilla Thunderbird:

  1. Select the menu icon (the three lines) in the upper-right corner, then select Account Settings.

    Account Settings in Mozilla Thunderbird
  2. Select Composition & Addressing under your email address in the left sidebar.

    Composition & Addressing in Mozilla Thunderbird Settings
  3. Make sure the Compose messages in HTML format box is checked, then select Global Composing Preferences.

    Compose messages in HTML format and Global Composing Preferences in Mozilla Thunderbird Settings
  4. Select General in the left sidebar, then scroll down to Language & Appearance to adjust the default font and text size.

    Language and Apperance in Mozilla Thunderbird settings

    Select Advanced under Fonts & Colors for more options including fonts for different languages.

  5. Close the Thunderbird settings windows. The change will take effect the next time you compose a message.

Change the Font in Thunderbird Messages

To change the font for individual emails, start composing your messages and select Format > Font.

Format in the Mozilla Thunderbird message composition window
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