Thunderbird useful add-ons and tricks
Last update
2026-08-06
2026
08-06
« — »

Settings

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security.dialog_enable_delay = 100  # faster enabling of dialog boxes buttons (download, confirm)

Date & Time formats (ref1, ref2):

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intl.date_time.pattern_override.date_short = "yyyy-MM-dd"
intl.date_time.pattern_override.time_short = "HH:mm"

Add-ons

Obsolete

Date format

OBSOLETE: TB uses the system locale settings in order to display the date and time, you can change them by setting the LANG environment variable:

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#!/bin/bash
# http://kb.mozillazine.org/Date_display_format
# https://bugzilla.mozilla.org/show_bug.cgi?id=1426907
export LANG=it_IT.UTF-8 # DD/MM/YYYY HH.MM
exec /opt/thunderbird/thunderbird

Dark theme

  1. Install TT DeepDark theme
  2. Preferences > Display > Formatting > Fonts & Colors > Colors button, then swap Text and Background colors
  3. If you write HTML emails: Preferences > Composition > General, then swap Text and Background colors

Logging

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MOZ_LOG=SMTP:4,timestamp MOZ_LOG_FILE=tb.log thunderbird