urxvt-ml-option-popup (1) Linux Manual Page
option-popup – option menu (enabled by default) DescriptionBinds a popup menu to Ctrl-Button2 that lets you toggle (some) options at runtime. Other extensions can extend this popup menu by pushing a code reference onto "@{ $term->{option_popup_hook} }", which gets called whenever the popup is being displayed. Its sole argument is the popup menu, which can…
