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ThunderBirthDay
Requires Restart
Display birthdays from the Thunderbird addressbooks as events in Lightning.
Esign
Requires Restart
Электронная подпись для сообщений в Thunderbird на основе API клиента "ГУЦ"
Correct Identity
Ever sent mail from the wrong email address because you forgot to select the correct identity?
CALDAV - Search/Subscribe
Requires Restart
Add CalDAV search & subscribe feature to Lightning
XML Digital Signature Tool
Requires Restart
XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)
Gmail Buttons
Requires Restart
Adds message-specific buttons to Thunderbird that are consistent with the way Gmail handles Trash and Spam.
Contacts Sidebar
Requires Restart
Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.
Visit my Contacts Sidebar site for recent versions and news.
CuteButtons
Teamworkx Thunderbird Integration for Jira
Requires Restart
This is a add-on for Thunderbird as well as Seamonkey 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.
Hebrew spell-checking dictionary (from HSpell)
Hebrew spell-checking dictionary for Firefox and Thunderbird. Generated from data of the HSpell project version 1.4, and distributed freely under the AGPLv3.
SoundPlus
Requires Restart
SoundPlus customizes the sound that is played when a new message arrives for a particular contact in the address book, similar to mobile phones. There is also a variation that is played when a message arrives and it is a continuation of a thread.
TreeStat
Use Bcc Instead
Requires Restart
Sorry but this addon is no longer supported in TB 60. See below.
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?
Compact Menu 2
Requires Restart
Add a compact menu button to the navigation toolbar, and hide the menu bar.
EmailPicky 4
Requires Restart
Grab email addresses from emails from any selected Email Folder and add them to your contacts. (Email Crawler / Email ID Grabber / Bounced email collector) - Thunderbird Plugin
Note: It doesn't create duplicates, but shows as 'xxx messages added'.
Perfect View
Image viewer with smooth dynamic zoom, pan and rotate. View slide shows of images or files and capture page elements and tab content. Apply image filters. Save images in various formats.
Bamboo Feed Reader
Requires Restart
Feed reader | RSS - ATOM - OPML
This extension has NOT been rewritten with the new WebExtensions API (Firefox Quantum).
No future version is planned by the original developer.
Bamboo is still running with Palemoon.
SyncKolab
Requires Restart
SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).
Menu On Top (SuperMenu Avatar)
Requires Restart
Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.
Subject ManagerTo create your own collections, you must have a Mozilla Add-ons account.
