Hi, my name is ***** ***** I'll do my best to assist you today.
First, please open up a new Compose/Write window in Thunderbird, and then do the following:
Press the ALT key on your keyboard - this will temporarily show the menu bar at the top of the Compose/Write window.
Next, click on the View menu and then click Toolbars, and then click "Composition Toolbar."
This will bring back the missing toolbar along with the Send button.
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