Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Add menu commands for replying to multiple messages at the same time.
CardDAV Browser Requires Restart
A utility to browse vCards stored on a CardDAV server.
Contact Photos Requires Restart
Displays contact photos in the message header.
gContactSync Requires Restart
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.
PlayFlash 64bit Requires Restart
Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.
PlayFlash 32bit Requires Restart
Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.
Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
Caret Out Requires Restart
Disables change of the caret browse mode by shortcut key(F7).
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.
ToggleReplied Requires Restart
Enables toggling of replied, forwarded, and redirected states of messages.
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.
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.
Lightbird Requires Restart
Standalone calendar UI for Lightning
Search with Joy! Block Ads While Surfing!
AutoProxy-ng Requires Restart
This is a fork of AutoProxy, which can run the latest version of Firefox.
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.
Provider for Google Calendar Requires Restart
Allows bidirectional access to Google Calendar
Addons Recent Updates Requires Restart
Show more addons recent updates
InfoLister Requires Restart
Lists installed add-ons (extensions, themes, plugins). Mozilla does not allow me to publish the version compatible with Firefox 48+, see http://forums.mozillazine.org/viewtopic.php?f=48&t=2084957&p=14715558#p14715558 for details.