ToggleReplied Requires Restart
Enables toggling of Replied/Forwarded states of messages.
UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.
Restart the current application, as you might need to do after installing a new extension or theme.
Filter Uploader for Adblock Plus (unofficial) Requires Restart
DOES NOT BLOCK ADS! Don't install this add-on if you don't know what 'uploading' means!
This add-on Uploads the filters from your Adblock Plus installation to a FTP, HTTP, HTTPS server...
MinimizeToTray Requires 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...
OverbiteFF Requires Restart
ToneQuilla Requires Restart
Adds a new action to mail filters to allow playing a particular sound when the filter matches. Also includes several sample sound files.
Quitomzilla Requires Restart
Quitomzilla helps you quit smoking while you surf the web or wait for new emails, showing the cigarettes, money and time you have saved since you quit...
Lets the user direct the submission of a form to a new tab or window. [Bug #17754]
Use SeaMonkey as a standalone e-mail client. Set up a default browser for links opened from Mail & Newsgroups.
Focus Regainer Requires Restart
Return focus from embedded object back to browser on browser hotkeys pressed.
ChatZilla Requires Restart
A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
PONG! Multiplayer Requires Restart
Play a game of PONG! while you are waiting.
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.
Focus Regainer Lite Requires Restart
Return focus from embedded object back to browser on browser hotkeys double pressed.
Clean Subject Requires Restart
"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.
Copy As Plain Text Requires Restart
Removes formatting from copied text.
AutoProxyMod Requires Restart
Based on original AutoProxy!
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
Lightbird Requires Restart
Standalone calendar UI for Lightning