JSB will never work again going forward unless Apple reverses this decision. 'Apple has dropped support for what they deem 'legacy extensions'. If Apple does in the future allow for extensions like JS Blocker, I will be very grateful. JS Blocker was brilliant, incredibly useful and relatively easy to use. It no longer works with Safari and will not be updated to fit into Apple's requirements. JS Blocker is IMHO the most unfortunate casualty. Unfortunately, not all of Apple's choices in blocked extensions made sense. Apple's goal was to increase Safari security. Safari 12.0 radically changed its extension system.