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Who among us has not made the mistake of sending a 'broadcast' email to a large number of recipients without using BCC; thereby revealing everyone's email addresses to all? This simple add-on attempts to prevent this from occurring.

Rated 5 out of 5 stars (22)
4,577 users

SQLite ManagerRequires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (58)
189,595 users

Fast Mail RedirectRequires Restart

Allows the fast redirection of emails...

Rated 5 out of 5 stars (5)
224 users

compactfolderRequires Restart

A toolbar button for compacting/purging the currently-viewed...

Rated 5 out of 5 stars (5)
379 users

Always HTMLRequires Restart

Disable automatic degradation of HMTL mails to plain-text mails.

Rated 5 out of 5 stars (6)
1,753 users

Force RTL

Force a LTR locale to behave as if it was a RTL locale.

Rated 5 out of 5 stars (6)
192 users

Imap-ACL-ExtensionRequires Restart

Extension to manage acls/permissions for shared mailboxes/folders on imap servers.

Rated 5 out of 5 stars (15)
2,653 users

Toolbar Buttons

Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.

Rated 4 out of 5 stars (328)
111,400 users

Folder Filters ButtonRequires Restart

Just a very simple add-on that adds a toolbar button to execute the "Run Filters on Folders" from Tools menu.

Rated 5 out of 5 stars (19)
3,665 users

Lightning Month TabsRequires Restart

Rated 5 out of 5 stars (8)
9,257 users

Filter Of FiltersRequires Restart

A search bar for vast number of filters.If you have a vast number of filters, it is difficult to find out a certain filter to edit. This add is for helping you on this situation.

Rated 5 out of 5 stars (8)
950 users

ToggleRepliedRequires Restart

Enables toggling of Replied/Forwarded states of messages.

Rated 5 out of 5 stars (7)
719 users

XpungeRequires Restart

Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.

Rated 4 out of 5 stars (35)
14,032 users

Restartless Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (216)
23,312 users

Baby cats and kittens in the about box...

Rated 5 out of 5 stars (6)
21 users

URL Link is a small Firefox and Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.

Rated 4 out of 5 stars (50)
11,747 users

LaTeX It!Requires Restart

This addons allows you to write LaTeX expressions in your emails such as $x^2$ or $$\sum_{x=0}\infty$$ and have them all replaced by a PNG image with the corresponding formula inside.

Rated 4 out of 5 stars (26)
2,273 users

MinimizeToTrayRequires Restart

Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible...

Rated 4 out of 5 stars (466)
9,776 users

Calendar TweaksRequires Restart

Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.

Rated 4 out of 5 stars (56)
14,935 users

Quicker FilerRequires Restart

Quicker Filer helps you file your messages into folders using keyboard shortcuts and quick search method. Navigate through folders by typing the start of a folder name and the Quicker Filer dialog will show you all folders that matches as you type.

Rated 4 out of 5 stars (36)
896 users