Extensions by Name

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Signature Fixer

Fixes the Signature Stacking bug for Forwards/Replies.

Rated 2 out of 5 stars (4)
463 users

Signature Switch Featured

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

Rated 4 out of 5 stars (156)
92,493 users

Silent Block

Minimum and fast URL blocker by regular expression.

Rated 5 out of 5 stars (16)
10,600 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 (15)
721 users

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (4)
8,739 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)
1,746 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)
263 users

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (102)
14,861 users

Simple Week View

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

Rated 4 out of 5 stars (2)
203 users

Single Domain

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)
5 users

sipgateFFX for Firefox and Thunderbird

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 4 out of 5 stars (18)
6,927 users

Size in KB

Use KB for size in the thread pane

Rated 5 out of 5 stars (1)
320 users

SJCall

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)
18 users

Skyrock by RaouF

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

Not yet rated
3 users

Slideshow

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 (67)
7,764 users

Slim Add-ons Manager No Restart

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 (44)
11,808 users

Smart Folders For Single Account (restartless) No Restart

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)
487 users

Smart Quotes

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
110 users

SmartFilters

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)
296 users

SmartSave Thunderbird Extension

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 (113)
3,455 users