Discussion of shortcut keys and toolbars

Is it possible to add some shortcut keys and buttons to the toolbar, most of the current toolbars are related to the markdown language. Should you add some toolbars of buttons related to actions, such as undo and reply.
I'm really not familiar with shortcuts, I prefer toolbar buttons.
Can you support custom toolbar buttons so that you can meet everyone's different needs?
Has anyone ever used Firefox, like he did?
A related video was recorded.

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