Hi Thanks，it is a great add-on. I wonder maybe you could add a left mouse and right mouse functions changing options, that I prefer left mouse for history list.
This has been requested several times, now. Unfortunately this is not possible. The only way to have both in one Addon (undo with one click and history list) is to make use of the so-called "browserAction" (Left click only) and add the history to the context menu (right click only).
