Up & Coming Extensions

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Select Address Book Text

Copy and paste a name, phone number, address or other text from your Thunderbird address book quickly, with just a single menu click.

Rated 4 out of 5 stars (39)
5,476 users

Autohide Tabbar

This extension auto-hides the tab bar.

Rated 4 out of 5 stars (30)
6,924 users

Lightning Month Tabs

This addon adds month tabs into Lightning calendar month view

Rated 5 out of 5 stars (8)
10,360 users

Viral Threat Level

Adds an image to the status bar indicating the current threat level of the internet. It allows quick access to security information that you can use to help protect yourself, and links to antivirus software comparisons and security extensions.

Rated 4 out of 5 stars (22)
1,385 users

Signature

insert custom text into posts and emails...

Rated 4 out of 5 stars (72)
1,996 users

ReminderFox

ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Rated 4 out of 5 stars (483)
103,410 users

Sieve No Restart

This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...

Rated 4 out of 5 stars (24)
9,148 users

Folderpane Tools

Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.

Rated 4 out of 5 stars (120)
41,218 users

G-Hub Lite

Adds Google Tabs to Thunderbird. Services include Voice, Calendar, Drive (Docs), Contacts, Groups, News, Books, Play, Maps, Sites, Finance, Picasa, Plus. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 3 out of 5 stars (17)
2,997 users

Google Docs Viewer (PDF, DOCX, PPTX, XLSX, etc...)

View publicly-accessible PDF, DOCX, PPTX, XLSX, among other files online with Google Docs by only 2 clicks. Click as usual for your default viewer. Support bookmarked URLs. Security and your explicit viewing intention are always honored.

Rated 4 out of 5 stars (59)
62,200 users

Mail Redirect Featured

Allow to redirect (a.k.a. "bounce") mail messages to other recipients.

Rated 4 out of 5 stars (122)
29,341 users

Duplicate Contact Manager

Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.

Rated 3 out of 5 stars (90)
22,106 users

Thunderbird Biff

This add-on provides a visual indicator of new Thunderbird mail availability in supported clients (Firefox, Sunbird) and Thunderbird itself. Note: you MUST install this add-on in BOTH Thunderbird and supported clients as there are both client AND ser...

Rated 4 out of 5 stars (39)
6,391 users

Contact Photos

Displays contact photos in the message header.

Rated 4 out of 5 stars (22)
1,929 users

CuteMenus - Crystal SVG

Note from Mozilla: This add-on has been discontinued. Try Menu Icons Plus instead.

Adds icons to all menus along with some other features...

Rated 4 out of 5 stars (103)
6,102 users

Add Signature

Simply add your signature manually (right mouse click) to your emails

Rated 3 out of 5 stars (33)
7,515 users

Change Referer Button

Button in the toolbar/status bar to change referer value.

Rated 5 out of 5 stars (20)
2,502 users

Free/Busy

Publish free/busy calendar file (*.ifb) via ftp or to a file. View other people's free/busy info in meeting organizer window. Integrate Thunderbird and Outlook calendars without Exchange server.

Rated 3 out of 5 stars (9)
1,370 users

Image Zoom Featured

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (328)
176,321 users

Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (140)
40,391 users