Add-ons
Up & Coming Extensions
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Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
Theme Font & Size Changer (fixed)
Fixed version (no 90 day timer till silent failure) of the popular "Theme Font & Size Changer for Thunderbird" addon
Toggle Headers
Allows to switch between the normal header view and viewing all headers when viewing a message by using a keyboard shortcut (Ctrl+H).
Textmarker
Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)
Dark Reader
Dark mode for every email. Take care of your eyes, use dark theme for night and daily messaging.
HTML Source Editor
Allows to edit the source of the currently composed message. A simple alternative to ThunderHTMLedit.
ReFwdFormatter
Remove the ">" prefix from quote when you make a reply.
[Source code] https://github.com/isshiki/ReFwdFormatter
Copy Sent to Current
Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.
✨ Awesome Emoji Picker ✨
Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.
You will certainly like it.
mailmindr
Follow up for Thunderbird E-Mails.
Web: https://mailmindr.net/
Twitter: @mailmindr
SPAMBEE
Report any unsollicited email (SPAM, Phishing, ...) to SPAMBEE.
Get an alert if you open an email containing a URL already known as fraudulent.
All reports are anonymized, no registration is required.
Attach from Clipboard
Duplicate Contacts Manager
Requires Restart
This Thunderbird add-on searches address book(s) for pairs of matching contact entries.
It can automatically delete entries that have equivalent or less information than the other one.
Any remaining matches are presented for manual treatment.
tbkeys-lite
Custom Thunderbird keybindings
This add-on is a follow on to Keyconfig which is no longer supported.
It is aimed at power users. Please look at the GitHub site before leaving a one star review about documentation or usability.
Minimize on Close
Causes Thunderbird's main window to minimize instead of closing. You can still close Thunderbird through the menu.
quicker quicksearch
make searching for emails faster:
Automatically insert into the quickfilter box: the author, subject or the email domain of the selected email.
No need to retype the address, if you want to search for all emails of this author.
Edit Email Subject (EES)
JavaScript Debugger
Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.
Night and Day Dynamic
A theme that switches between sun and moon based on time of day.
This is the canonical example dynamic theme published by Mozilla: https://github.com/mdn/webextensions-examples/tree/master/dynamic-theme
To create your own collections, you must have a Mozilla Add-ons account.
