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Show Password On Input Requires Restart

Gives an option to show the master password on input

Rated 4 out of 5 stars (11)
611 users

ShowIP Requires Restart

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 (280)
23,267 users

Shrunked Image Resizer Requires Restart

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

This extension is not being converted to a WebExtension.

Rated 4 out of 5 stars (33)
8,604 users

Sidebar Add Custom Tab Requires Restart

Adds an 'add custom tab' option to the Tabs drop-down menu of SeaMonkey's sidebar.

Rated 5 out of 5 stars (1)
29 users

Silent Block

Minimum and fast URL blocker.

Rated 4 out of 5 stars (30)
3,772 users

Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (12)
32,904 users

Single Key Tab Switch Requires Restart

Single Key Tab Switch provides configurable single hotkeys for switching tabs, like the 'Single-key shortcuts' feature of the Opera browser.

Rated 4 out of 5 stars (27)
694 users

Singlish to Sinhalese Requires Restart

Singlish to Sinhalese Conversion provide by Subasa Language Service

Not yet rated
26 users

Size in KB Requires Restart

Use KB for size in the thread pane

Rated 5 out of 5 stars (1)
428 users

Slashy Requires Restart

Fixes Windows backslash file separators in links and images and other types.

Rated 4 out of 5 stars (5)
308 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 (51)
5,934 users

SM Home Button Requires Restart

Navigation bar Home Button (resurrected by sailfish)

Not yet rated
24 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 (50)
17,824 users

smftn Requires Restart

download directly from QQ file transportation over 7/200 times limit

Rated 5 out of 5 stars (6)
38 users

Smiley Fixer Requires Restart

Fixes Wingding Smileys in Outlook-generated emails

Rated 5 out of 5 stars (18)
5,346 users

Snic

Smart Near-Infrared Control.

Not yet rated
1 user

Soapy Requires Restart

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
17 users

SolusVM VPS Monitor Requires Restart

Status Monitor for SolusVM-backed VPS.

Not yet rated
27 users

Sort and Search Customization Dialogs Requires Restart

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

Rated 5 out of 5 stars (16)
475 users

SourceEditor Requires Restart

View and Edit source of HTML element...

Rated 4 out of 5 stars (19)
966 users