Up & Coming Extensions

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Clippings Requires Restart

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (185)
34,597 users

Yet Another Remove It Permanently Requires Restart

Remove elements and block content on Web pages.

Rated 4 out of 5 stars (44)
2,114 users

ThunderBirthDay Requires Restart

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Rated 4 out of 5 stars (85)
18,184 users

Buttons! Requires Restart

Adds buttons to the Thunderbird toolbars such as Next! and Previous! buttons for navigating through all messages instead of just unread ones. See homepage for more...

Rated 4 out of 5 stars (63)
1,369 users

Lightweight Themes Manager

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (9)
12,357 users

Spanish Dictionary for Spelling Requires Restart

Important!!! If you can't see the Mexican flag, please click View --> Toolbars --> Bookmarks Toolbar.

Select a text in Spanish appearing on any web page and get a spelling check for it immediately!

Rated 5 out of 5 stars (3)
2,675 users

Bring to OneNote Requires Restart

Send text and images to Microsoft Office OneNote from firefox. With section dialog, we can select an OneNote section to store page with title.

Rated 3 out of 5 stars (5)
2,086 users

MailHops Requires Restart

MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.

Rated 4 out of 5 stars (26)
3,278 users

Export for Thunderbird & Lightning Launcher Requires Restart

Export for Thunderbird & Lightning is the worldwide unique printing and exporting solution for Mozilla Thunderbird and Lightning for Windows.
Multi lingual user interface: English, German, French and Spanish

Rated 2 out of 5 stars (9)
1,147 users

Babylon Dictionary Word Search Requires Restart

Find the definition for a selected word in a web page or an email.
Right click over the selected word, choose the option "Search in Babylon" and that's it! You will have a new window with the definition of the selected word.

Rated 4 out of 5 stars (45)
3,837 users

Unsubscribe from Mailing List Requires Restart

Allows recipients to cancel their newsletter subscriptions in the thunderbird interface.

Rated 4 out of 5 stars (13)
1,172 users

InspectorWidget Requires Restart

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.

Rated 5 out of 5 stars (7)
1,188 users

Execute JS Requires Restart

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

Rated 5 out of 5 stars (13)
4,786 users

No need flash plugin on embeded youtube movies

No need flash plugin on embeded youtube movies

Rated 4 out of 5 stars (2)
6,846 users

Stylish Tools Requires Restart

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 (3)
1,398 users

Phoenity Buttons Requires Restart

Adds some toolbar buttons using phoenity icons.
Displays message headers more compact (2 lines).

Rated 5 out of 5 stars (5)
1,196 users

Window Master

Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.

Rated 4 out of 5 stars (10)
2,114 users

YT2Player

Allows for easy sending of YouTube videos to an external media player.

Rated 5 out of 5 stars (4)
1,122 users

Rikaichan Japanese-French Dictionary File Requires Restart

A dictionary file for Rikaichan.

Not yet rated
2,741 users

Mnenhy Requires Restart

The primary goal of the Mnenhy project is to make some enhancements to SeaMonkey MailNews/Thunderbird, since there're still plenty of comfort functions missing if compared to Netscape 4.x and other mail and news clients.

Rated 4 out of 5 stars (41)
2,792 users