gnome terminal question?

Hi, i'm using gnome-terminal version 3.18.3 in Linux Mint 18 (cinnamon)

and i'm trying to figure out how to enable hotkeys on the right-click menu

in gnome-terminal 3.6.2 (linux mint 17.1) i can do right-click (on a URL) 
and then press the O key (on the keyboard) to choose "open URL"

but in gnome-terminal 3.18.3 (linux mint 18) if i right-click (on a URL) 
there are no key assignments to the menu, and pressing O (or any other 
letter) does nothing.  I would have to move the mouse or use the arrow 
keys and press ENTER.

can anyone help me figure out what's wrong?  I don't understand why the 
hotkeys disappeared.

thank you
-jake