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

Thunderbird, Postbox

Toggle Toolbar

Toggle the main toolbar from showing to hidden. Don't place it on the main toolbar, it is disabled then and will not work.

Install Toggle Toolbar

Download Toggle Toolbar

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Toolbar Display

Set the toolbar icon size as either large or small, and the button display mode between icons, icons and text, or text only.

Install Toolbar Display

Download Toolbar Display

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Toolbars

Show and hide toolbars quickly and easily.

Toolbars use up valuable screen real estate, removing them frees this up to show more web page or email depending on what your doing.

Install Toolbars

Download Toolbars

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Unread Threads

View threads that you have not read yet.

Install Unread Threads

Download Unread Threads

Compatibility: Thunderbird, Postbox SeaMonkey

Update

Check for updates to the currently open application.

Install Update

Download Update

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

View Menu

Show the view menu.

Install View Menu

Download View Menu

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Watched Threads with Unread

View watched threads that have unread messages in them.

Install Watched Threads with Unread

Download Watched Threads with Unread

Compatibility: Thunderbird, Postbox SeaMonkey