OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
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.
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
Display birthdays from the Thunderbird addressbooks as events in Lightning.
Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.
"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.
Collections are groups of related add-ons that anyone can create and share.Explore Collections