d3/d3-plugins — pull request #111 by bhousel (2014-10-12 05:15:40+00:00)
Title: Firefox-specific keycodes for plus, minus, equals

Firefox uses different keycodes for several keys.
(copying changes to `keybinding.js` from openstreetmap/iD project)

see also https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent.keyCode