I have used to procrastinate on news sites a lot.

This helped me:

1. Install Firefox on your phone (I use hardened FF called Fennec)

2. Uninstall all the other browsers (except Tor)

3. Install addon: https://addons.mozilla.org/en-US/android/addon/leechblock-ng/

4. Add sites to block

5. Do the same for your other devices

7. Enjoy using your new free time meaningfuly

***

You can also use your `/etc/hosts` (on desktop) file to block it everywhere

```

0.0.0.0 www.example.com

0.0.0.0 example.com

::0 www.example.com

::0 example.com

```