Excellent Addon Rated 5 out of 5 stars

But, I only need it sometimes. It won't be my default, therefore I really need:
- a toggle button to show/hide OR rare hotkey to show/hide

Currently, it does not hide when you disable the addon, and eventually can break by causing an extra column of blank space to show up in FireFox when playing with show-on-right-side option.

Luckily the issue went away after re-installing the addon completely.

Perhaps add two reset buttons, 1) "Reset" (for layout), and 2) "Reset All" (for everything) ?