With the latest update, my days are stuck. By that, yesterday's date keeps appearing. Or if I don't re-install, it stays at the last time I've refreshed/reset it. Not sure if it is on the extension's end or on Firefox's since its last update.
Not possible to add city for some time now FF 66.0.2 and Forecast 4.20. Started in 2018. I do not live in New York so this extensision has become obsolete for me, sorry. Understand, more users with this problem but with some prehistoric versions FF and Forecast.