Up & Coming Extensions

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Personal Level Indicators

Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.

Rated 4 out of 5 stars (12)
3,089 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)
16,881 users

Black background and white text No Restart

Makes black background and white text on every page

Rated 5 out of 5 stars (16)
4,341 users

CheckBoxMate Lefedor Edition

Check multiple checkboxes by drawing a rectangle around them. FF6 version.
I've made this version since i did need it for use with RTM,

Rated 4 out of 5 stars (9)
1,157 users

AVIM

An input method editor (IME) for Vietnamese. Type Vietnamese diacritics directly into any Web page, Web app, or dialog box.
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Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, và hộp thoại.

Rated 5 out of 5 stars (30)
2,920 users

Display mail route

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

Rated 4 out of 5 stars (11)
1,004 users

Torrent Tornado

A Torrent Client for Firefox and SeaMonkey, runs everywhere, created in pure JavaScript without binary software!

Rated 4 out of 5 stars (34)
26,287 users

YouTube Flash Video Player No Restart

YouTube Flash Video Player is a powerful tool that will let you choose Flash video player as default YouTube video player.

Rated 5 out of 5 stars (26)
232,913 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)
2,539 users

Display Mail User Agent

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (102)
34,833 users

Polskie Radio podcast download No Restart

Zmiany w serwisie Jedynki, aktualizuj: https://addons.mozilla.org/pl/firefox/addon/podcast-polskieradio/versions/0.8

Dodaje opcję pobierania (link "Pobierz") podcastów ze stron Polskiego Radia http://polskieradio.pl/ do plików MP3/FLV na dysk.

Rated 5 out of 5 stars (7)
1,225 users

WebODF No Restart

Viewer for OpenDocument Format office files. It can display documents saved from LibreOffice, OpenOffice, Calligra, Abiword, Microsoft Word, Excel, PowerPoint. The documents should be saved in the OpenDocument Format.

Rated 5 out of 5 stars (6)
2,399 users

Browser View Plus (PlayLink)

Open links, pages, and bookmarks in any other browser or media player. Modify any menu, browser name or location. Incognito/private browsing mode is also supported.

Rated 5 out of 5 stars (17)
1,485 users

Imagus No Restart

Enlarge thumbnails, and show images/videos from links with a mouse hover.

Rated 5 out of 5 stars (30)
8,829 users

Anaglyph 3D

Convert image to 3d image (anaglyph).

Rated 4 out of 5 stars (7)
1,187 users

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (33)
51,625 users

RequestPolicy Sync No Restart

Sync engine for RequestPolicy.

Rated 5 out of 5 stars (3)
1,566 users

Disable clipboard manipulations No Restart

This extension prevents websites from interfering with your copy and paste actions.

Note: The same functionality is now built into Firefox, you can just change the dom.event.clipboardevents.enabled preference manually.

Rated 5 out of 5 stars (22)
4,247 users

YesScript

A JavaScript blacklist

Rated 4 out of 5 stars (191)
47,815 users

Stylish Tools

Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey

Rated 4 out of 5 stars (1)
1,144 users