A "+ New Message" button visible when the Address Book is open?

[TomLumb]

I would find it very convenient to have this button available when I am looking at my Address Book, as well as when I am looking at my Inbox

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[Agentvirtuel]

Hello

For information purposes
Writing messages https://support.mozilla.org/en-US/kb/keyboard-shortcuts-thunderbird#w_writing-messages

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Toggle Contacts Sidebar

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+ New message
https://connect.mozilla.org/t5/ideas/thunderbird-interface-design-new-message-with-multiple-email/id...
About + New message, have you verified
View > folder > folder pane header
See, youtube video, by way of illustration