"Send Later Button" add-on doesn't seem to do anything

I’m trying to test Thunderbird’s “Send Later Button” add-on. It’s supposed to add a “Send Later” button to the Write window’s toolbar, but I don’t see that button appear. I’m on Windows 10 Pro, running Thunderbird 68.4.1 (64-bit). Thunderbird says it is “up to date”. Is that add-on working for other users?

It works here, but you have to add it to the Write window’s Composition Toolbar by right-clicking the bar, Customize, and dragging the button onto the bar.

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