This browser addon replaces the textual values on the TopMeteo site forecast with human readable, colored arrows à la MeteoParapente.
Firefox addon: https://addons.mozilla.org/de/firefox/addon/topmeteo-arrows
Chrome addon: https://chrome.google.com/webstore/detail/topmeteo-arrows/cpllephbgocomflakadgnldkhcncigjh
Microsoft Edge addon: (in review)