Extensions by Name
Show Password On Input Requires Restart
Gives an option to show the master password on input
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.
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.
Sidebar Add Custom Tab Requires Restart
Adds an 'add custom tab' option to the Tabs drop-down menu of SeaMonkey's sidebar.
Minimum and fast URL blocker.
Simple Locale Switcher Requires Restart
An easier management of the user interface language
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.
Singlish to Sinhalese Requires Restart
Singlish to Sinhalese Conversion provide by Subasa Language Service
Size in KB Requires Restart
Use KB for size in the thread pane
Slashy Requires Restart
Fixes Windows backslash file separators in links and images and other types.
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.
SM Home Button Requires Restart
Navigation bar Home Button (resurrected by sailfish)
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.
smftn Requires Restart
download directly from QQ file transportation over 7/200 times limit
Smiley Fixer Requires Restart
Fixes Wingding Smileys in Outlook-generated emails
Smart Near-Infrared Control.
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.
SolusVM VPS Monitor Requires Restart
Status Monitor for SolusVM-backed VPS.
Sort and Search Customization Dialogs Requires Restart
Sort and search for buttons in (any) toolbar customization dialog
SourceEditor Requires Restart
View and Edit source of HTML element...