Extensions by Name

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Show Calendar Week

Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.

Rated 5 out of 5 stars (5)
2,589 users

Show Fixed-width Temporarily

Show the current plain text message in fixed-width text.

Rated 4 out of 5 stars (3)
302 users

Show InOut

Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...

Rated 5 out of 5 stars (42)
2,443 users

Show Password On Input

Gives an option to show the master password on input

Rated 4 out of 5 stars (11)
1,011 users

Show SMTP Username

Displays username (if available) next to SMTP...

Rated 1 out of 5 stars (1)
49 users

ShowIP

Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.

Rated 3 out of 5 stars (286)
46,248 users

Shrunked Image Resizer

Make your photos smaller, so they don't take forever to email or send to websites.

Rated 4 out of 5 stars (33)
8,042 users

Sieve No Restart

This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...

Rated 4 out of 5 stars (24)
10,177 users

Sieve Out of Office New

A Thunderbird plugin to allow one to set out of office messages and / or redirect emails to colleagues via a easy to use pop-up dialog.

This Out of Office plugin requires that your POP3 / IMAP server also have a sieve service.

Rated 3 out of 5 stars (1)
274 users

Signal Spam

Cette extension va ajouter dans Mozilla Thunderbird une fonction de signalement qui vous permettra de transmettre d’un seul clic les messages que vous considérez comme spam à Signal Spam, le réseau de confiance pour agir contre le spam.

Rated 3 out of 5 stars (22)
9,367 users

Signature

insert custom text into posts and emails...

Rated 4 out of 5 stars (72)
1,568 users

Signature /Auto Paste /Prefill Fourms

Makes everyday entries to forms & forums simpler!
Add a sig. with just a Rclick of the mouse and select 'Add Sig.' from the context menu.
(Please, note: What you see in the pic is only an example. ThoseRMine Sorry, you have to make your own tabs. )

Rated 4 out of 5 stars (24)
4,296 users

Signature Fixer

Fixes the Signature Stacking bug for Forwards/Replies.

Rated 2 out of 5 stars (4)
399 users

Signature Switch

Switch the signature on/off or choose a new one from your predefined set...

Rated 4 out of 5 stars (178)
86,519 users

Silent Block No Restart

Minimum and fast URL blocker.

Rated 5 out of 5 stars (16)
8,134 users

Simple HT Jumper

A temporal simple jumper of HTML and Plan TEXT view mode on showing messages and replying messages for Thunderbird without changing the default setting.

Rated 5 out of 5 stars (17)
700 users

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (7)
17,502 users

Simple Search-For Extension

Adds a "Search for" item to Thunderbird's context menu, like in Firefox.

Rated 5 out of 5 stars (14)
1,572 users

Simple Steganography

Hide messages in PNG-32 images, extract them via context menu. The text is embedded invisibly by a "Least Significant Bit" algorithm.

You can also encode very short messages by re-sorting text lists and extract them via context menu.

Rated 5 out of 5 stars (2)
290 users

Simple Week View

A simple week view for Lightning, as in the print layout.

Rated 3 out of 5 stars (3)
585 users