> I have seen in my own use of the modern browser (chromium/firefox) that it is far too easy to get distracted - too easy to get off track and fall down rabbit holes that take over my day.

I have a very easy solution for that: zero sound output from my main desktop/workstation computer. I mean: technically I leave the sound drivers and the sound on, but there's nothing connected to the output (so speakers / no headphone).

The deep underlying philosophical question being: "If a PC outputs audio to nothing plugged into it, does it make a sound?"

The answer doesn't really matters though. What matters is that it's a great way to not get distracted.

My main desktop emits, on purpose, no sound since... 20 years?

For the rest, I've got laptops.