I'm a huge fan of LeechBlock [1] and use it on every general-purpose computer that I own. I commit various blocklists to a public GitHub repo and configure each instance to download the lists at startup. I have a hard block list for useless/previously-overfrequented sites and a soft block that is configured to block after a specified period; the soft block is also configured as a hard block on my work laptop.

It's astounding how your thought process changes when you aren't stuck compulsively doom-scrolling through ML-derived feeds of worthless nonsense.

[1] https://addons.mozilla.org/en-US/firefox/addon/leechblock-ng...