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by benzor 3078 days ago
Good point on the 20-20-20 rule. There's an add-on for Firefox which I use for this below [1]. It launches a (rather invasive) fullscreen popup reminder every 20 minutes. Far from perfect, but better than using a loud timer or relying on your distracted brain!

[1] https://addons.mozilla.org/en-US/firefox/addon/eye-strain-pr...