Recently Updated Extensions

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Dark Background and Light Text (SeaMonkey)

Makes every page to have light text on dark background (exact colors are customizable)

Firefox version is here: https://addons.mozilla.org/firefox/addon/dark-background-light-text/

Rated 5 out of 5 stars (2)
15 users
Updated Oct. 24, 2017

Mouse Gestures Suite Requires Restart

Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.

Rated 5 out of 5 stars (58)
13,723 users
Updated Oct. 21, 2017

RequestPolicy Continued

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (17)
7,022 users
Updated Oct. 19, 2017

CipherFox Requires Restart

Displays the current SSL/TLS cipher, protocol and certificate chain in the Add-on bar and Site ID dialog

Rated 5 out of 5 stars (34)
3,647 users
Updated Oct. 13, 2017

Save Images Requires Restart

Save Images saves the images from the current tab page, from the cache, to a specified location, with either the images original file name or a file name that you specify.

Rated 4 out of 5 stars (362)
31,888 users
Updated Oct. 12, 2017

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (13)
1,244 users
Updated Oct. 10, 2017

ToggleReplied Requires Restart

Enables toggling of replied, forwarded, and redirected states of messages.

Rated 4 out of 5 stars (2)
51 users
Updated Oct. 7, 2017

Multi Web Search Requires Restart

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 (15)
1,925 users
Updated Oct. 6, 2017

Enigmail Requires Restart Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (197)
134,845 users
Updated Oct. 3, 2017

Cookies Exterminator

Auto delete cookies, localStorage and IndexedDB objects as soon as they become unused

Rated 5 out of 5 stars (15)
2,163 users
Updated Oct. 2, 2017

PrefBar Requires Restart

The all in one toolbar(item). Houses and manages bigger amounts of buttons (Clear Cache, Clear Cookies, ...), Menus (User Agent spoof...) and checkboxes (Javascript, Flash, ...). Extensible from online-database or with self created buttons.

Rated 5 out of 5 stars (40)
10,703 users
Updated Oct. 1, 2017

DOM Inspector Plus! [dm] Requires Restart

Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.

Rated 4 out of 5 stars (5)
376 users
Updated Sept. 27, 2017

Send Later Requires Restart

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

Rated 5 out of 5 stars (105)
61,109 users
Updated Sept. 26, 2017

Show InOut Requires Restart

Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...

Rated 5 out of 5 stars (40)
1,755 users
Updated Sept. 15, 2017

Copy Sent to Current Requires Restart

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (67)
2,928 users
Updated Sept. 15, 2017

Classic Toolbar Buttons

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.

Beta builds on versions page!

Rated 5 out of 5 stars (137)
28,405 users
Updated Sept. 13, 2017

Remote Content By Folder

Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.

Not yet rated
16 users
Updated Sept. 10, 2017

GNotifier

Add-on for Thunderbird that replaces the built-in notifications with OS native ones. It supports most Linux Desktop Environments as well as Windows 8.1/10.

Rated 5 out of 5 stars (42)
10,205 users
Updated Sept. 8, 2017

Thunderbird Integration for JIRA Requires Restart

This is a plugin for Thunderbird 3.3+ which is able to create Atlassian Jira issues out of e-mails or add the content of an e-mail as a comment on an Jira issue.

Rated 4 out of 5 stars (10)
322 users
Updated Sept. 8, 2017

Shrunked Image Resizer Requires Restart

Make your photos smaller, so they don't take forever to email or send to websites.

This extension is not being converted to a WebExtension.

Rated 4 out of 5 stars (33)
8,028 users
Updated Sept. 8, 2017