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PrettyBlockquote

The add-on ensures that the quoted text in your reply is clearly highlighted with a vertical blue line, even when viewed by recipients using different email clients like Gmail or macOS, by using inline CSS on the blockquote HTML tag.

Rated 5 out of 5 stars (3)
35 users

Plastikthunder Crystal SVG Requires Restart

Plastik style from KDE with Crystal SVG icons for...

Rated 2 out of 5 stars (7)
0 users

Tamizha Spellchecker Requires Restart

Tamil spell checker derived from the OpenOffice spell­­­­checker created by Tamizha Team

Not yet rated
2 users

Uyghur Spelling Dictionary (ئۇيغۇرچە ئىملا لۇغەت)

Uyghurche Imla Lughet ئۇيغۇرچە ئىملا لۇغەت
Enables spell checking in any text field for Uyghur Arabic Alphabet.

Not yet rated
1 user

Classic Highlight Requires Restart

Highlight folders containing new messages using the classic theme

Rated 4 out of 5 stars (1)
0 users

Humanity Requires Restart

A Humanity-Theme for linux-users. Works well with elementary or Humanity iconsets. Uses a lot of gtk-standard icons.

Rated 4 out of 5 stars (5)
0 users

Dolnoserbski (dsb) rěcny pakśik

Lower Sorbian language pack for Thunderbird - Dolnoserbski rěcny pakśik za Thunderbird - Niedersorbisches/Wendisches Sprachpaket für Thunderbird

Not yet rated
12,128 users

Secure Addressing Plus Requires Restart

Fork of "Secure Addressing" addon by Hiroya Matsuba with some added features.
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This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient addresses upon sending.

Not yet rated
1 user

Use BCC Instead C Requires Restart

This addon prevents you accidentally sending an email to a large number of recipients without hiding their addresses from each other by using BCC. It is for TBv68.

IT WILL NOT BE UPDATED FOR TBv78.
Try my addon 'Limit non-BCC recipients'

Rated 3 out of 5 stars (5)
197 users

Monterail Full Dark Requires Restart

Monterail Full Dark, a Thunderbird theme inspired by the mockup of Monterail

Rated 5 out of 5 stars (18)
17 users

BorderColors D

Shows a colorful border around the "New Message" window, so you can tell different identities apart.

Builds on the original BorderColors and the "GT" version, adding different border styles.

Rated 4 out of 5 stars (34)
7,227 users

ansitel Click-to-Dial

This plugin will call a selected number by clicking the right mouse button.

Rated 5 out of 5 stars (1)
83 users

Search for

Context menu on message allowing quick filtering based on email/sender or domain

Rated 5 out of 5 stars (7)
1,283 users

Autocrypt Requires Restart

E-Mail encryption that gets out of your way. Compatible with Autocrypt and OpenPGP.

EARLY ACCESS, MAY CONTAIN BUGS!

Caution: This extension can not be used together with Enigmail. Please remove Enigmail before installing.

Rated 4 out of 5 stars (10)
3 users

Monterail Darkness Extended

Monterail Dark, a Thunderbird theme inspired by the mockup of Monterail extended to Calendar, Tasks and Composer. Some more tweaks to normalize heights of the tabs and other options.

Rated 5 out of 5 stars (5)
65 users

Just Report It

Just Report It (https://justreport.it) is an email plugin which tackles spam the right way. Report emails straight to SpamCop, the Registrar, a custom email address or any combination in between!

Rated 5 out of 5 stars (16)
800 users

Custom sync interval for Lightning Calendar Requires Restart

Allows custom synchronization intervals for remote calendars imported by Lightning Calendar (no fiddling in about:config necessary)

Rated 5 out of 5 stars (1)
68 users

Telegram Web in Thunderbird

Open Telegram Web in Thunderbird

Rated 5 out of 5 stars (5)
603 users

Autofile - fast e-mail to folder filing

Read an e-mail, hit Autofile button and it is filed / moved to the right mail folder based on the sender's address. No drag/drop needed. Autofile can discover folders to store each author mail. Will save you lots of time like defunct filemail.

Rated 4 out of 5 stars (6)
286 users

Export to ZIP

Export your mails and folders to a zip file!

Rated 3 out of 5 stars (12)
1,832 users