Very Good. I think it could have been better if it provided the shortcut feature that I can manage in Firefox Add-ons Manager. Nevertheless, the developer has commented below that he implemented 'right-click', so it might substitute the shortcut.

Two tweaks would make this a 5-star must-have add-on:
1) keyboard shortcut (ctrl+m is popolar for competing add-ons)
2) setting for default AI to use when clicking the button

This is probably the most useful extension I've every used!