If you check one or more of the "SHIFT key", "ALT key" and "CTRL key" checkboxes, the popup menu will open if you click on a link, image or frame corner while holding one of these keys.
If you check one or more of the "right mouse button" and "middle mouse button" checkboxed, the popup menu will also open if you click a link, image or frame corner with that mouse button.
If you deselect all four checkboxes, the popup menu is disabled.
Keys
Settings requesters
Arexx