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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)
7,868 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)
13,686 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)
500 users

Smart Quotes

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
114 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)
298 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)
3,437 users

SmartTemplate

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 (110)
2,016 users

SmartTemplate4

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 (48)
18,490 users

Smiley Fixer

Fixes Wingding Smileys in Outlook-generated emails

Rated 5 out of 5 stars (15)
5,074 users

Smilie Inserter

Insert smilies in messages...

Rated 4 out of 5 stars (42)
885 users

SmilieInserter Plus

Insert smilies in messages.

Rated 5 out of 5 stars (17)
3,585 users

SmoothWheel

Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).

Rated 5 out of 5 stars (242)
51,736 users

SMS Sidebar

If you work in front of a computer and send a lot of SMS text messages this is for you. Finally you can send SMS from the privacy of your Mozilla application. The focus of this addon is on efficiency, ease of use and easy access to advanced SMS featu...

Rated 2 out of 5 stars (17)
90 users

SMSalias MozClient

SMSalias is a Firefox/Thunferbird extension that enables you to send SMS messages directly from Browser/email application...

Rated 1 out of 5 stars (2)
66 users

SMTP Control

SMTP Control is a Thunderbird Add-ons offering dynamic selection of outbond SMTP server while sending a message.

By default thunderbird offer the ability to define a list of SMTP servers. With one global default server for all email accounts or one ...

Rated 3 out of 5 stars (25)
1,343 users

SmtpSelect

A toolbar button providing easy access to choosing the default SMTP server in Thunderbird.

Rated 5 out of 5 stars (36)
6,236 users

SmtpSwitch

SmtpSwitch allows to choose the smtp server when clicking on the 'Send' button.

Rated 4 out of 5 stars (21)
2,255 users

Soapy

Bypasses DNS-based censorship

NOTE: This was created as a SOPA protest in 2012. This does not work anymore for most sites. Use Tor instead.

Not yet rated
116 users

Solpets Quick Button

A quick button link to the virtual pet site, Solpets.com.

Not yet rated
1 user

Sort and Search Customization Dialogs

Sort and search for buttons in (any) toolbar customization dialog

Rated 4 out of 5 stars (13)
543 users