QuickFolders (Tabbed Folders)

QuickFolders (Tabbed Folders) allows you to cut through the clutter of the folders sidebar with your favorite folders as tabs. Open folders and sub folders, move mails without scrolling around or searching.

CompactHeader

CompactHeader add a symbol to the header plane that allows you to switch between compact and expanded view.

Automatic dictionary

Automatic dictionary is an extension that remembers the language of the email when composing, something very useful if you write emails in different languages.

Cert Viewer Plus

Cert Viewer Plus is a Thunderbird add-on that extends the certificate viewer dialog with additional options: an X.509 certificate can be displayed in PEM format (opens in a new window) or saved to a file (PEM/DER/PKCS#7). On the "General" tab, Cert Viewer Plus will also show any e-mail addresses included in the certificate, and make the fingerprint values copyable. On the "Details" tab, the trust configuration (SSL/Mail/Code) is shown for each certificate, and can be edited in newer releases of Firefox/Thunderbird/Seamonkey. Furthermore, an entry for direct access to the certificate manager dialog is added to the Tools menu, together with a keyboard shortcut.

This add-on is also available for Firefox.

Certificate Patrol

Certificate Patrol is a Thunderbird add-on that reveals when certificates are updated, so you can ensure it was a legitimate change. Note that your browser trusts many certification authorities and intermediate sub-authorities quietly, every time you enter an HTTPS web site.

It is also available for Firefox.

Maximize Message Pane

Maximize Message Pane allows you to maximize the message pane by collapsing the thread pane. You can read a message in larger area without opening a new message window.

In addition to this functionality, the following functionalities are provided:

• hide the folder pane,
• change folder selection from the toolbar button or the context menus (it is useful when the folder pane is hidden),
• hide the message pane by the toolbar button,
• save visibility of the folder pane and the last selected message.
• change message selection by the navigation bar when the message pane is maximized

Note that this add-on does not work properly if you use the Wide Thread View or Stacked View provided by MoreLayouts.

Tag Toolbar

Tag Toolbar adds a new toolbar and display the tags you have created as toggle buttons. You can attach/remove tags to/from the selected messages. The tag buttons' states are changed automatically, so you can easily know what tags are attached to the message. Moreover, you can filter the tags to be displayed by categorizing tags. You can create and change category from the listbox on Tag Bar.

Some UTF-8 Settings for Thunderbird

It is beyond me why Thunderbird still sticks to outdated ISO 8859-1 as default setting for displaying and sending news. Fortunately it is easy to fix this and use UTF-8 instead:

Preference Name	Default	New
intl.charset.default	ISO-8859-1	UTF-8
mailnews.send_default_charset	ISO-8859-1	UTF-8
mailnews.view_default_charset	ISO-8859-1	UTF-8

Google Contacts

Google Contacts is a Thunderbird add-on which allows you to access your Google contacts and synchronize them with Thunderbird address books. It detects gmail accounts which have already set up and creates address books for each of them.

Cards in the address books are synchronized with Google contacts; they represent the current Google contacts contents and Google contacts will be modified when you modify the cards. TB's mailing lists and Google's contacts groups are synchronized in the same manner.

Gather the senders !

Gather the senders ! allows you to select all the mails in a directory sent by the selected authors. This add-on has a number of applications, the most obvious one is discarding messages by a certain sender (spammer).

MoreLayouts

MoreLayouts adds additional Wide Thread and Stacked views to Thunderbird. Plus Fullscreen F11 and configurable Message Pane F8 toggle.

Search Results Sort By Date Not Relevance

Search Results Sort By Date Not Relevance changes the default sorting of search results from “relevance” to date.

Normally, when doing a standard CTRL-K (aka “faceted”) search, the results are sorted by  ”relevance”. If you are usually searching for the most recent message on a topic it is very annoying that you always have to change the sort order to “date” because neither does Thunderbird keep the setting nor is there an easy way to change the default. Enters Search Results Sort By Date Not Relevance.

Xpunge

Xpunge empties the Trash folder and compacts folders in multiple Thunderbird accounts.

Clean Subject

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.

Advanced Unread Folders

Advanced Unread Folders adds a folder view showing unread folders, including their hierarchy. This is helpful if you have a lot of folders to make sure you don't miss an email, or if you are not happy with the existing unread folders view.

Auto Compress File

Auto Compress File is a compressor for attachment files that supports Windows, Linux, and Mac.

Show Fixed-width Temporarily

Show Fixed-width Temporarily shows the current plain text message in fixed-width text.

This extension is useful if you normally view plain-text messages with a variable-width font (which is easier to read than a fixed-width font) but wish to view one in a fixed-width font temporarily. Such emails might be text arranged in columns, such as log files, where a variable-width font misaligns the text.

A button is added to the Toolbar (right-click on Toolbar and Customize…). Clicking on it shows the current plain text message in a fixed-width font. The effect only lasts for the current message and automatically reverts back to the default setting (as set in Options) for the next message. You don't have to click on the button again to revert back to the default state.

Enigmail

Enigmail adds OpenPGP message encryption and authentication to your email client. It features automatic encryption, decryption and integrated key management functionality. Enigmail requires GnuPG (www.gnupg.org) for the cryptographic functions (which is not part of the installation).

Manually sort folders

Manually sort folders allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Nostalgy

Nostalgy is a Thunderbird add-on that provides keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion. I love this add-on because I so much more efficient using a keyboard than using a clumsy pointing device.