https://marco.org/2007/03/22/one-more-tip-we-got-regarding-leopard-is-that
One more tip we got regarding Leopard is that InputManager plugins are no longer allowed. That’s right… no more little hacks from anybody besides Apple. No more Apple menu hacks. No more Safari plugins.
— Leopard not ready for April: If that’s true, say goodbye to Saft and Sogudi…