Thunderbird add-ons that I've either used for years, or tested and highly suggest.
abandoned, use Stylish Custom Add-on instead
custom additions to Stylish extension.
brings back features from 0.5.9 and adds new features
This addon adds month tabs into Lightning calendar month view
Associates user-defined colors with accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.
Adds a summary of mail accounts and folders to replace the account central pane and the empty folder preview
The main goal allows users to open (and in some cases edit) page source with external applications.
Latest version is always available at http://dafizilla.sourceforge.net/viewsourcewith
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
(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...
Zoom in, zoom out, and reset zoom with one toolbar button. Works in the Compose window too.
Maximize message pane by collapsing the thread pane. You can read a message in larger area without opening a new message window...
This add-on provides a follow-up email feature for Thunderbird.
This add allow to customize the snooze delay when snooze popup appears (lightning required).
Allows you to configure a set of WebApps to open easily as tabs within Thunderbird trying to give them all the functionality that you'd find in Firefox.
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