How can I block a site in chrome

I would like to block some websites to improve my productivity.

Is there any way to block some sites in Google Chrome, preferably an extension or so? It doesn't have to be "airtight" blocking (hey, it is for myself), but just deny access when I find myself accessing that page.

Note that editing my host files is not possible. This seems to be the only solution that comes up when googleing for it.

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