How to move to sidebar to the right?

[listvin]

Sidebar is currently on the left, is it possible to move it to the right?
I use ff primarily on left monitor, so neck kinda hurts (:

I searched through settings, checked discussions and issues, seems nothing on topic.

Extension is extremely cool as it is, THANK YOU for great work. I feel kinda shame for asking more (:

[albino1]

This is already built into Firefox: