How to disable special character selection popup when a key is held down There was a fix that worked with Lion in this question

defaults write -g ApplePressAndHoldEnabled -bool false 

but that no longer seems to work in Mavericks. 

Has anyone figured out how to turn off the special character insertion popup that appears when you hold a key down in Mavericks?
That command still works in Mojave, High Sierra and Mavericks — don't forget to reboot or logout/login after running the command.