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ImportExportTools
Requires Restart
Adds some tools to import and export folders and messages
Session Manager
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
Mail Redirect
Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
ChatZilla
Requires Restart
A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
Lightbird
Disable Addon Compatibility Checks (Version 4-56)
Reinstates the extensions.checkCompatibility preference.
Diagnostics for Adblock Plus
Diagnostics tool for Adblock Plus, provides some insight into internal processes of Adblock Plus.
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.
Addons Quick Search
Requires Restart
Type first letters of add-on name to find them in the list or press Ctrl+↑/↓ to switch between add-ons categories.
Additionally remember and restore last selected item in each list.
Extension Auto-Installer
Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.
Join-NG
Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
Flexible Identity
Requires Restart
Selects an identity based on the recipients list when sending an email
Standalone SeaMonkey Mail
Use SeaMonkey as a standalone e-mail client. Set up a default browser for links opened from Mail & Newsgroups.
BOINC Stats 2
Requires Restart
Displays your Total and Recent Average Credits for BOINC distributed computing projects in the status bar.
TimerFox
Requires Restart
Easily counts down from a predefined number and alarms you when the count has reached zero.
Custom Sender Address and Reply
Requires Restart
Select sender mail address based on the recipient and reply with the same address
Manually sort folders for SeaMonkey
Requires Restart
This extension allows you to manually sort (order) your folders in the folder pane of SeaMonkey Mail or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.
To create your own collections, you must have a Mozilla Add-ons account.
