Add-ons

Provider for Google Calendar by Philipp Kewisch

Allows bidirectional access to Google Calendar

gContactSync by Josh Geenen

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Calendar Tweaks by DW-dev

Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.

Google Contacts by H.Ogi

Access to Google contacts and synchronize them with Thunderbird address books.

Collector's Note Its not portable - yet. I will try to contact developer.

Contact Tabs by thunderspeed

Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.

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

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.

Lightning QR Code Add-on by Harald Judt

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

Dictionary Switcher by Dao Gottwald, MrWarper

Toggles dictionaries automatically or manually and displays the currently selected one

New Tab Button by H.Ogi

It provide you the following functionalities:
* Open a selected message in a tab by a toolbar button
* Open a message in a tab by double-clicking its header view (disabled by default)
* Hide Lightning's Today Pane on opening a tab

Eesti keele speller by Sander Lepik

Estonian spellchecking dictionary for Firefox, Thunderbird and Seamonkey...

AddressBookTab by pastisman

It adds a button that can be put in toolbars and that open the addressbook in a new tab

Clip to OneNote by Jayarathina Madharasan

Clip to OneNote is a free add-on which helps you to send text, pictures and other data to Microsoft Office OneNote with a single click.

xSidebar for Thunderbird by Philip Chee

Firefox sidebars for Thunderbird.

Gmail IMAP Account Setup by H.Ogi

Add Gmail IMAP options to the account wizard. You can easily set up Gmail IMAP by this extension.

MR Tech Toolkit by mrtech

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...