Here's a similar one that I build few years back. It forces you to wait specified number of seconds before visiting a website. That way you break the dopamine cycle.
breaking the dopamine cycle requires a bigger effort because it must include phone browsing and notifications, there is a good video about it at https://www.youtube.com/watch?v=9QiE-M1LrZk
https://chrome.google.com/webstore/detail/waitblock/kcnjfepp...