These are a ready make selection of some of the most popular buttons from the Custom Toolbar Button Maker

Thunderbird, Postbox

Previous Message

Get the previous message. Unlink the default Thunderbird buttons this just go to the previous in the list, or if shift is pressed, the previous unread.

Install Previous Message

Download Previous Message

Compatibility: Thunderbird, Postbox SeaMonkey

Toggle Read

Toggle the Read status of the currently selected message.

Install Toggle Read

Download Toggle Read

Compatibility: Thunderbird, Postbox SeaMonkey

Delete Events

Delete an event.

Install Delete Events

Download Delete Events

Compatibility: Thunderbird, Postbox SeaMonkey

Delete Tasks

Delete a task.

Install Delete Tasks

Download Delete Tasks

Compatibility: Thunderbird, Postbox SeaMonkey

Edit Draft

Edit a message that you have saved as a draft.

Install Edit Draft

Download Edit Draft

Compatibility: Thunderbird, Postbox SeaMonkey

Format

Show the Format Menu

Install Format

Download Format

Compatibility: Thunderbird, Postbox SeaMonkey

Go

Show the Go Menu

Install Go

Download Go

Compatibility: Thunderbird, Postbox SeaMonkey

New Event

Add a new event into the calendar.

Install New Event

Download New Event

Compatibility: Thunderbird, Postbox SeaMonkey

New Task

Add a new task to the calendar.

Install New Task

Download New Task

Compatibility: Thunderbird, Postbox SeaMonkey

Open in Conversation

Open the current message in a conversation tab

Install Open in Conversation

Download Open in Conversation

Compatibility: Thunderbird, Postbox SeaMonkey