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Disable "You"
Requires Restart
Addresses in the From/To/Cc headings are since Thunderbird 3 replaced with word "You" if they match any of your identities. This extension disables this function.
About:about Button
A button that lists all the about pages that exist. Some of these pages are also provided as separate buttons.
NirvanaHQ
Large Fonts
Requires Restart
This add-on enables you to change the font size of the plain text editor of Thunderbird.
Add-on Preferences Button
Displays a menu that allows you to open the option/preference window for any add-on that has one.
Find Buttons
Extensor
Quick access to add-on functions from a toolbar panel: Options, (De)Activate, Details, Home page, Review page, Donation page, Uninstall, Restart application.
Play drums!
3e Calendar
Hindi Pop up
Requires Restart
After installing this extension, just hover the mouse on top of an English word and a pop-up will appear with suggestions of possible hindi equivalents.
Keychain Services Integration
Requires Restart
Store usernames and passwords in your Mac OS X Keychain.
Test Pilot for Thunderbird
Moji
Requires Restart
An integrated sidebar-dictionary for Japanese and Chinese including kanji dictionary.
Enhanced Desktop Notifications
Provides enhanced new mail desktop notifications using the notify-send library. Linux only.
Greek Polytonic Spelling Checker
Διορθωτὴς πολυτονικῶν κειμένων σύμφωνος μὲ τὴν ἑλληνικὴ ἱστορικὴ ὀρθογραφία.
Flexible Identity
Requires Restart
Selects an identity based on the recipients list when sending an email
To create your own collections, you must have a Mozilla Add-ons account.
