There are lots of extensions available, but only some should be installed, 'cause a huge amount of extensions installed, will slow down the overall performance.
This is the list of extensions, I really recommend to have:
- Addressbooks Synchronizer
Synchronizes selected addressbooks
- with local files (resp. files on network shares)
- with files via FTP or WebDAV (http or https)
- with files stored in an IMAP folder
An integrated calendar for Thunderbird.
Adds to the address book more features, like the possibility to edit some properties in multiple contacts with just one action, adds an extra tab with the birthday date, the spouse name etc.
It can be used in conjunction with ThunderBirthDay (see below).
- MR Tech Local Install
The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally.
(Note: This extension can be used also in Firefox.)
Enables you to avoid sending mail to specific recipients when you use mailing list containing a lot of recipients and you wish to avoid sending the mail to specific individuals.
- Quote Colors
Configure text and background colours for different quote levels in mail/news messages.
- Signature Switch
Switch the signature on/off or choose a new one from your predefined set.
Additional features include the support of fortune-cookie-files and automatic switching based on recipients.
Display birthdays from the Thunderbird address books as events in Lightning.
Needs the MoreColsForAddressBook extension as well.
This extension integrates web site based email accounts (like Hotmail, Yahoo, AOL, ...), which allows Thunderbird to download and to send emails using the web site.
You might like to use Mail Notification for receiving advises about new mail arrivals in your mail accounts.