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SmoothWheel

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

Rated 5 out of 5 stars (246)
45,958 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)
77 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)
59 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 (27)
1,172 users

SmtpSelect

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

Rated 5 out of 5 stars (36)
5,867 users

SmtpSwitch

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

Rated 4 out of 5 stars (21)
2,089 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
101 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 (14)
493 users

SortPref

Adds the ability to control primary, default sorting and threading options.

Rated 4 out of 5 stars (9)
1,521 users

SortRecipients

SortRecipients lets you alphabetically sort the recipients lists (To/Cc) when composing a message, simply by clicking the Sort button, which it adds to the Compose window toolbar.

Rated 4 out of 5 stars (4)
423 users

SoundPlus

SoundPlus customizes the sound that is played when a new message arrives for a particular contact in the address book, similar to mobile phones. There is also a variation that is played when a message arrives and it is a continuation of a thread.

Rated 3 out of 5 stars (13)
2,692 users

South African English spell checker

The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.

"No more eina, just a lekker spell checker!"

Rated 5 out of 5 stars (3)
2,396 users

Spamato4Thunderbird

A multi-faceted, collaborative approach against spam.

Rated 2 out of 5 stars (31)
457 users

Spamness

Visual representation of how spam-like messages are.

Rated 3 out of 5 stars (18)
628 users

Spanish Dictionary for Spelling

Select a text in Spanish appearing on any web page and get a spelling check for it immediately!

Not yet rated
2,627 users

Splash!

Adds a splash screen to most Mozilla and Mozilla Based products. Supports sound, opacity, CSS customization, custom images, and much more. You can add {appVersion}, {buildID} and {userAgent} to the loading text and it will be filled in for you.

Rated 4 out of 5 stars (104)
4,853 users

Splash! (Compatibility Update)

Adds a splash screen. Supported in Firefox, Flock, Thunderbird, Sunbird, eMusic Remote, Songbird and Sunbird.

Rated 3 out of 5 stars (17)
490 users

Splash! (Compatible version of Firefox 4)

Adds a splash screen. Supported in Firefox, Flock, Thunderbird, Sunbird, eMusic Remote, Songbird and Sunbird.

Rated 1 out of 5 stars (2)
22 users

Spoof Detector

Extension for Email Spoofing Detection

Rated 2 out of 5 stars (1)
64 users