Miscellaneous

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Dorando keyconfig Requires Restart

A modified Dorando's addon to rebind keyboard shortcuts. It is designed to be a drop-in replacement, keeping your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) work again!

Rated 5 out of 5 stars (47)
4,544 users

Thunderbird Message Filter Import/Export Enhanced Requires Restart

Thunderbird Message Filter Import/Export Enhanced is a compatibility port of Wind Li's add on.
Original add on here: https://addons.mozilla.org/en-US/thunderbird/addon/thunderbird-message-filter-imp/

Rated 3 out of 5 stars (51)
4,229 users

Address Close Button Requires Restart

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (25)
4,177 users

AutoConfiguration Hook Requires Restart

Provides ability to create E-mail accounts for specific ISP via the account creation wizard.

Not yet rated
4,115 users

Minimize On Start and Close Requires Restart

A remake of the MinimizeToTray-extension made to fit the Windows 7 taskbar. Instead of minimize the window to the tray it minimize it to the taskbar. It can minimize on startup, when the window is closed and/or when the esc key is pressed.

Rated 4 out of 5 stars (109)
3,734 users

Classic Toolbar Buttons [Tb24-58] (discontinued)

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7 small view, Fx4-12 large view & Tb5-14) for current Firefox, Thunderbird and Seamonkey versions.

Rated 5 out of 5 stars (145)
3,290 users

IMAP Quota (Free Space) Requires Restart

This Thunderbird addon lets you customize the IMAP quota statusbar panel.

Rated 5 out of 5 stars (3)
3,238 users

ThunderKeepPlus

Google Keep for Thunderbird

Rated 5 out of 5 stars (12)
3,047 users

Year view Requires Restart

Year view for calendar.

Rated 4 out of 5 stars (50)
3,031 users

Rise of the Tools

Moves the toolbar back above the tabbar.

Rated 5 out of 5 stars (57)
2,747 users

URL Link Requires Restart

URL Link is a small Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.

Not yet rated
2,484 users

GPO support For Firefox and Thunderbird

For work with new versions, use autoconfiguration module https://mozillagpo.sourceforge.io/
Firefox and Thunderbird extension to manage user preferences and user profile CA certificates using group policy

Rated 4 out of 5 stars (13)
2,445 users

Imap-ACL-Extension Requires Restart

Extension to manage acls/permissions for shared mailboxes/folders on imap servers.

Rated 4 out of 5 stars (10)
2,342 users

Lightning QR Code Add-on

Integrate QR codes for calendar events into tooltips for easy transfer to mobile devices.

Rated 5 out of 5 stars (13)
2,114 users

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (17)
2,060 users

Google Tasks Sync Requires Restart

Manage your tasks from Thunderbird, even while offline.

Rated 4 out of 5 stars (96)
1,896 users

Element Hiding Helper for Adblock Plus

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

Rated 5 out of 5 stars (473)
1,815 users

List Addons in Windows' Programs

List addons in Windows' "Add or Remove Programs".

Not yet rated
1,805 users

Ruler Bar Requires Restart

This appends a ruler to the mail composition window.

Rated 4 out of 5 stars (8)
1,559 users

Return Receipt Toolbar Button Requires Restart

Allow you to add a Return Receipt button to mail compose window toolbar.

Rated 5 out of 5 stars (11)
1,521 users