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Mark All Read Button
Requires Restart
Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.
Paranoia
Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)
QuoteCollapse
Requires Restart
Collapse and expand quotes.
Contributors: Stanimir Stamenkov, Dillinger
Show Calendar Week
Requires Restart
Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.
Yet Another Remove It Permanently
Requires Restart
Remove elements and block content on Web pages.
Zoiper Thunderbird Plugin
Requires Restart
It allows you to make calls via Zoiper from Mozilla Thunderbird.
QFO - Quick Fuck Off
Requires Restart
This extension serves the purpose of providing instant access to the FOAAS web service. FOAAS (Fuck Off As A Service) provides a modern, RESTful, scalable solution to the common problem of telling people to fuck off.
Show Address Only
Requires Restart
Adds columns to display Sender/Recipients mailaddress only.
Feedly Synchronizer
BorderColors GT
Requires Restart
How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.
AttachExtraTools
Requires Restart
This extension gives more options and tools to attach files from compose window.
Extra Folder Columns
Requires Restart
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
IMPORTANT: If you are using Thunderbird 38 or later, uninstall this addon. The functionality is in core now.
QuickArchiver
Get things done and clean up your inbox! When you move an e-mail the first time, QuickArchiver remembers the destination folder and lets you move more e-mails with a single click. You can apply rules by sender, recipient, and subject.
PitchDark for TB
Requires Restart
Dark-colored minimalistic theme with emphasis on visibility, usability and maximum screen real estate.
Menu Editor II
Requires Restart
Hides or moves menus and menu items. (Deprecated version, see below.)
Český slovník kontroly pravopisu (bez diakritiky)
Slovník pro kontrolu pravopisu u textů bez diakritiky pro aplikace Mozilla
Opacus SugarCRM 6.2+ Thunderbird Integration Pro
Requires Restart
SugarCRM 6.2.0-8.x/SuiteCRM 7.x Integration for Thunderbird
Enables archiving of emails into SugarCRM and SuiteCRM from Thunderbird. Requires a purchased license key (you can request a trial from within the extension).
Thunderbird Taiga Integration
Requires Restart
Convert mails to user stories, tasks and tickets for the Taiga project management system. See https://pehei.de/post/thunderbird-taiga-integration for instructions.
techblockerTo create your own collections, you must have a Mozilla Add-ons account.
