To enable Emacs like keybindings globally on the operating system,
edit ~/Library/KeyBindings/DefaultKeyBinding.dict
to inlcude something like this:
/* ~/Library/KeyBindings/DefaultKeyBinding.dict */
{
/* Additional Emacs bindings */
"~f" = "moveWordForward:";
"~b" = "moveWordBackward:";
"~<" = "moveToBeginningOfDocument:";
"~>" = "moveToEndOfDocument:";
"~v" = "pageUp:";
"~d" = "deleteWordForward:";
"~^h" = "deleteWordBackward:";
"~\010" = "deleteWordBackward:"; /* Option-backspace */
"~\177" = "deleteWordBackward:"; /* Option-delete */
/* Escape should really be complete: */
"\033" = "complete:"; /* Escape */
}
Then reboot the system.
src: https://github.com/walter/additional-mac-os-x-emacs-key-bindings/blob/master/DefaultKeyBinding.dict