You should be able to now reload the addon by pressing F5, or Command-or-Ctrl + R. This has probably been added via bug 1708635. I'm not sure it is worth adding a reload button to surface this?
Bug 1693686 Comment 3 Edit History
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You should be able to now reload the addon by pressing F5, or Command-or-Ctrl + R. This has probably been added via bug 1708635 and/or bug 1718279. I'm not sure it is worth adding a reload button to surface this?