Top-Rated Extensions

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HashColouredTabs+

Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★

Rated 4 out of 5 stars (38)
1,707 users

Element Hiding Helper for Pan No Restart

Help you create element hiding rules for Pan to fight the text ads.

Rated 4 out of 5 stars (3)
423 users

Display mail route

Displays country icons for the stations (server) the mail has been routed.

Rated 4 out of 5 stars (11)
875 users

LookOut+

LookOut is a plugin which allows to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).

This version is a fix for Seamonkey 2.*.

Rated 4 out of 5 stars (3)
1,329 users

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (18)
2,353 users

xSidebar Featured

Firefox style sidebars for SeaMonkey...

Rated 4 out of 5 stars (11)
147 users

From/To Column

Add a “From/To” column which shows the recipient if you are the sender.

Rated 5 out of 5 stars (2)
201 users

Open RegEdit Key No Restart

[WINDOWS ONLY] Open selected registry key directly in the registry editor from context menu.

Rated 5 out of 5 stars (2)
341 users

View Source

Shows all source files of a webpage.

Rated 4 out of 5 stars (6)
1,187 users

HostIP.info Geolocation Plugin

Displays Geolocation information for a website using hostip.info data. Works with all versions of Firefox...

Rated 4 out of 5 stars (13)
1,412 users

Scroll Menus On Drag

Scrolls menus when dragging, fixing bugs 194319, 240709, and 349932. Scrolls all autorepeatbuttons and prevents bookmarks menu hiding on all menuseparators.

Rated 4 out of 5 stars (5)
21 users

No Caption No Restart

Hide the caption of Firefox

Rated 4 out of 5 stars (11)
245 users

EDS Calendar Integration

Integrates calendars events with Gnome clock applet

IMPORTANT:
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.

Rated 4 out of 5 stars (4)
182 users

Video Mouse Wheel No Restart

Use wheel mouse on videos to control video/audio/quality.
Choose flash/HTML5 on YouTube, autopause on background tabs, embedded videos.
And much more!

Rated 4 out of 5 stars (4)
312 users

Multi Web Search

For those who are looking for and want to find!
Find the most relevant information from the Web with a single request to different search engines and get the results on a single page

Rated 4 out of 5 stars (4)
970 users

FAYT Revived

Regain possesion of your good "Find As You Type" search bar in Firefox and SeaMonkey!

Rated 4 out of 5 stars (4)
125 users

SourceEditor

View and Edit source of HTML element...

Rated 3 out of 5 stars (20)
1,563 users

Stop Tube HTML5 No Restart

Stops autoplay of YouTube HTML5 videos (WebM). It is Flash-Block equivalent for HTML5 videos.

Rated 3 out of 5 stars (50)
7,960 users

SyncKolab

SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).

Rated 3 out of 5 stars (74)
6,448 users

Bitacora

Shows an icon on the status bar when the mouse cursor is over a link to a page you bookmarked or visited before. Update for fcp's addon

Rated 4 out of 5 stars (9)
25 users