The best alternatives to MinimalHero are OneTab, OneTask (Mac), and Intentio. If these 3 options don't work for you, we've listed a few more alternatives below.
OneTab, a free Chrome add-in, converts a set of browser tabs into a page of links, then restores the tabs when required. It can instantly free up gigabytes of memory when you need it for something else.
Intentio is a mindful approach to browsing the internet. It helps you develop healthy habits by promoting self-accountability and automatically starting the Pomodoro technique when you visit focus sites.