Up & Coming Extensions

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ShowIP Requires Restart

Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.

Rated 3 out of 5 stars (286)
43,657 users

IMAP Received Date Requires Restart

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (6)
1,826 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 (8)
3,669 users

BlunderDelay Requires Restart

Thunderbird Extension: AutoSend Unsent Messages. Flushes entire outbox at regular intervals.

Rated 4 out of 5 stars (13)
1,348 users

Year view Requires Restart

Year view for calendar.

Rated 4 out of 5 stars (47)
4,465 users

Copy As Plain Text Requires Restart

Removes formatting from copied text.

Rated 4 out of 5 stars (59)
20,324 users

NestedQuote Remover Requires Restart

Remove nested quotes when replying to a...

Rated 3 out of 5 stars (16)
2,904 users

Mail Summaries Requires Restart

Adds a summary of mail accounts and folders to replace the account central pane and the empty folder preview

Rated 5 out of 5 stars (40)
5,860 users

ThunderPlunger Requires Restart

This add-on provides a few new ways to keep Thunderbird clean.

Rated 4 out of 5 stars (30)
4,465 users

Copy Plain Text 2 Requires Restart

Copies text without formatting

Rated 5 out of 5 stars (67)
44,687 users

ThunderSync Requires Restart

Allows to synchronise Thunderbird's addressbook with external directories/files. Every contact is exported/compared with an external file. Right now, only vCard version 2.1 is supported as export file format.

Rated 3 out of 5 stars (19)
11,373 users

Encrypt if possible Requires Restart

Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.

Rated 5 out of 5 stars (16)
1,818 users

ReminderFox Requires Restart

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 (528)
77,577 users

Windows Contacts Loader Requires Restart

Loads Windows Contacts from Windows 7 or Vista in a Thunderbird Address Book called "Windows".

Rated 4 out of 5 stars (34)
5,564 users

addressContext Requires Restart

An extension to add addressbook-related options to the context...

Rated 4 out of 5 stars (50)
1,714 users

Show Address Only Requires Restart

Adds columns to display Sender/Recipients mailaddress only.

Rated 4 out of 5 stars (23)
3,234 users

Filter Uploader for Adblock Plus Requires Restart

DOES NOT BLOCK ADS! Don't install this add-on if you don't know what 'uploading' means!

This add-on Uploads the filters from your Adblock Plus installation to a FTP, HTTP, HTTPS server...

Rated 4 out of 5 stars (40)
15,843 users

Google+ Tab Requires Restart

Google+ Tab for Thunderbird

Rated 3 out of 5 stars (9)
2,354 users

ThunderBirthDay Requires Restart

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Rated 4 out of 5 stars (85)
19,121 users

Stylish Tools Requires Restart

Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey

Rated 4 out of 5 stars (3)
1,428 users