There is a chrome extension called Block Site which I’m using since yesterday (after reading this thread 
) and it’s nice! They also have Firefox extension and Android and iOS apps.
There is a Block Sites tab where you can add a list of sites to be blocked, or you can use it in whitelist mode to block all the websites except those in the list.
My favorite is the Work Mode tab. It has a Pomodoro timer. You can add a list of sites to the work mode, and it will block those sites only when you run the timer. It also has the whitelist mode, like the Block Sites tab.
You can also block by category. The adult category is blocked by default. Blocking other categories like Social, News, Sports is a premium feature.
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