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

Thunderbird, Postbox

DOM Inspector

Document Object Model Inspector

Open the DOM (Document Object Model) Inspector to view and manipulate the DOM tree.

Compatibility: Pale Moon 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

Find Again

Find Next Match

Find the next bit of text that matches your search.

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Find Previous

Find Previous Match

Find the previous bit of text that matches your search.

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Get Inbox

Change Focused Folder to the Inbox

Change the currently selected folder to your Inbox.

Compatibility: Thunderbird, Postbox SeaMonkey

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

Go

Show the Go Menu

Show the Go Menu

Compatibility: Thunderbird, Postbox SeaMonkey

Help

Open Help Menu

Show the Help Menu

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey

Ignored Threads

View Ignored Threads

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

Compatibility: Thunderbird, Postbox SeaMonkey

Insert

Show Insert Menu

Show Insert Menu

Compatibility: Thunderbird, Postbox SeaMonkey