Stop Dock Icons from Bouncing Completely

You can make the Dock icons stop bouncing completely, even when an application is trying to notify you of something, by entering the following command in the terminal:

defaults write com.apple.dock no-bouncing -bool TRUE

then you’ll want to restart the Dock by killing it for the changes to take effect:

killall Dock

You can get the bouncy Dock icons back by changing the commands parameter to FALSE rather than TRUE, and of course kill the Dock again afterwards:

defaults write com.apple.dock no-bouncing -bool FALSE