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

Thunderbird, Postbox

Forward Inline

Forward the current message as part of the email.

Install Forward Inline

Download Forward Inline

Compatibility: Thunderbird, Postbox SeaMonkey

Ignored Threads

View all the threads in the current folder that are set as ignored.

Install Ignored Threads

Download Ignored Threads

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

Paste As Quotation

Paste text so that it appears as a quoted message.

Install Paste As Quotation

Download Paste As Quotation

Compatibility: Thunderbird, Postbox SeaMonkey

Plain Text Paste

Paste text into Thunderbird without any formatting.

Install Plain Text Paste

Download Plain Text Paste

Compatibility: Thunderbird, Postbox SeaMonkey

Remote Content

Opens the window to set exceptions for the loading of remote content

Install Remote Content

Download Remote Content

Compatibility: Thunderbird, Postbox SeaMonkey

Search Addresses

Open the advanced address search window.

Install Search Addresses

Download Search Addresses

Compatibility: Thunderbird, Postbox SeaMonkey

Search Messages

Open the advanced message search window to find an email.

Install Search Messages

Download Search Messages

Compatibility: Thunderbird, Postbox SeaMonkey