Extensions by Name

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SixOrNot No Restart

IP address information for Firefox. SixOrNot is an icon-based display of IPv6 availability and utilisation also providing a listing of domain names and IP addresses involved in loading web pages.

Rated 4 out of 5 stars (14)
3,253 users

Size in KB

Use KB for size in the thread pane

Rated 5 out of 5 stars (1)
284 users

Slashy

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

Rated 4 out of 5 stars (5)
611 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)
12,519 users

SM Home Button

Navigation bar Home Button (resurrected by sailfish)

Not yet rated
33 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)
14,601 users

SmartWhois Launcher

This extension allows you to launch SmartWhois and perform a Whois query on the current URL. SmartWhois is a useful network information utility that allows you to look up all the available information about an IP address, hostname or domain...

Rated 3 out of 5 stars (6)
522 users

smftn

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

Rated 5 out of 5 stars (6)
51 users

Smiley Fixer

Fixes Wingding Smileys in Outlook-generated emails

Rated 5 out of 5 stars (15)
4,340 users

SmoothWheel

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

Rated 5 out of 5 stars (242)
48,581 users

Snap Links Plus

Select a number of links with a rectangle and open them all in new tabs in the same or a new window(s), download them or copy them to the clipboard. You can also lasso checkboxes to quickly check or uncheck them.

Rated 4 out of 5 stars (90)
19,206 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
102 users

SolusVM VPS Monitor

Status Monitor for SolusVM-backed VPS.

Not yet rated
20 users

Sort and Search Customization Dialogs

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

Rated 4 out of 5 stars (14)
496 users

SourceEditor

View and Edit source of HTML element...

Rated 3 out of 5 stars (20)
1,635 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)
2,354 users

Spanish (Spain) ChatZilla

Spanish (es-ES) Language Pack for ChatZilla

Rated 5 out of 5 stars (8)
1,500 users

Speed Dial

Direct access to your most visited websites

Rated 4 out of 5 stars (1,219)
437,023 users

SQL Cardfile

A simple card file database using SQLite as the backend.

Not yet rated
11 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (30)
192,323 users