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

Thunderbird, Postbox

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

Add Email

Add a new email address to the address book.

Install Add Email

Download Add Email

Compatibility: Thunderbird, Postbox SeaMonkey

All Threads

View all the threads in the current folder, not just unread or some other sub set.

Install All Threads

Download All Threads

Compatibility: Thunderbird, Postbox SeaMonkey

Archive Thread

Send the Selected Thread to the Archive

Install Archive Thread

Download Archive Thread

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

Detach Attachments

Detach Attachments from an email.

Install Detach Attachments

Download Detach Attachments

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

Edit Menu

Show the edit menu.

Install Edit Menu

Download Edit Menu

Compatibility: Pale Moon Thunderbird, Postbox SeaMonkey