Extensions by Name

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Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (9)
27,231 users

Simple Search-For Extension Requires Restart

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

Rated 5 out of 5 stars (14)
1,565 users

Simple Steganography Requires Restart

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)
308 users

Simple Week View Requires Restart

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

Rated 3 out of 5 stars (3)
643 users

Single Domain Requires Restart

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (1)
238 users

sipgateFFX for Firefox and Thunderbird Requires Restart

The sipgate extension enables a practical overview for your account, direct call list notifcations, a speed access to several parts of sipgate's website, initiaiting click2dial calls, sending messages and faxes directly from your browser.

Rated 3 out of 5 stars (19)
4,077 users

Size in KB Requires Restart

Use KB for size in the thread pane

Rated 5 out of 5 stars (1)
463 users

SJCall Requires Restart

SJCall is a beta version of a VoIP extension enabling you to place telephone calls directly from the Mozilla applications using SJphone, the world-leading Internet softphone...

Rated 4 out of 5 stars (3)
9 users

Skyrock by RaouF Requires Restart

Blogs, profils, rencontres, groupes,photos,.. Avec Skyrock.

Not yet rated
1 user

Slideshow Requires Restart

Displays a slideshow of picture attachments. When email has attached pictures, it displays "View as Slideshow" button next to the attachment. Button click pops a slideshow window with all the images, allowing you to zoom in/out, save...

Rated 5 out of 5 stars (68)
7,192 users

Slim Add-ons Manager

The Add-ons Manager slims down!
This add-on reduces the height of entries in the Add-on Manager, so you can display more of them at a time.

Rated 5 out of 5 stars (52)
8,946 users

Smart Folders For Single Account (restartless)

Adds smart folders (unified folders) for single account.
By default smart folders available only for two and more accounts.

Rated 5 out of 5 stars (3)
564 users

Smart OwnCloud Filelink Requires Restart

Filelink pour serveur Owncloud

Rated 4 out of 5 stars (1)
45 users

Smart Quotes Requires Restart

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
104 users

SmartFilters Requires Restart

Tired of writing a lot of filters? Install SmartFilters now to organise your mailbox automatically. It can sort out your mailing lists and robot emails.

Rated 3 out of 5 stars (3)
176 users

SmartSave Thunderbird Extension Requires Restart

Now you can export your messages in a smarter way! You can export all folders and subfolder esaily from your local folder or from your IMAP...

Rated 3 out of 5 stars (108)
2,294 users

SmartTemplate Requires Restart

This Add-on provides the smart and simple templates and abilities to customize the quote header flexibly.
Templates can be inserted automatically at the new/repling/forwarding message. A different template can be used respectively per account.

Rated 4 out of 5 stars (111)
1,407 users

SmartTemplate4 Requires Restart

SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.

Rated 5 out of 5 stars (53)
21,579 users

Smiley Fixer Requires Restart

Fixes Wingding Smileys in Outlook-generated emails

Rated 5 out of 5 stars (17)
5,809 users

Smilie Inserter Requires Restart

Insert smilies in messages...

Rated 4 out of 5 stars (42)
569 users