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

Thunderbird, Postbox

Get Themes

Get more Thunderbird themes

Open the Themes Manager to change your theme or install a new one. Only works in Firefox 1.5. Firefox 2 users should use the Add-ons Button.

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Message Pane

Toggle Message Pane

Show/Hide the Message Pane.

Compatibility: Thunderbird, Postbox SeaMonkey

Purge

Compact Folder, and Delete Junk

Delete all junk emails then compact all folders. Quick way to do both at the same time.

Compatibility: Thunderbird, Postbox SeaMonkey

Reload Proxy

Reload Proxy

Reload the currently in use proxy.

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Themes

Open Themes Manager

Open the themes manager to change you theme or install a new one.

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Delete Events

Delete Selected Events

Delete an event.

Compatibility: Thunderbird, Postbox SeaMonkey

Download/Sync Now…

Run download and sync before going offline

Runs the download and sync now tool, so that messages can be used when you go offline.

Compatibility: Thunderbird, Postbox SeaMonkey

Get Inbox

Change Focused Folder to the Inbox

Change the currently selected folder to your Inbox.

Compatibility: Thunderbird, Postbox SeaMonkey

Message

Show the Message Menu

Show the Message Menu

Compatibility: Thunderbird, Postbox SeaMonkey

New Event

Add a new event to the calendar.

Add a new event into the calendar.

Compatibility: Thunderbird, Postbox SeaMonkey