Recently, this add-on, which WAS wonderful and did exactly what I wanted it to do, changed.

In researching the issue, I discovered that the developer, Alexander (Oleksandr) Popov lives in Kyiv. In March of 2022, he posted a response to a Google conversations regarding Forecastfox that due to the Russian invasion of Ukraine, he's no longer able to lead the development of his addons.

"Oleksandr Popov
unread,
Mar 8, 2022, 2:28:02 AM

to forecastfox-users
I'm creator. I'm from Ukraine, Kyiv. Not Russia!!!!!
I can not now lead the development of extension, because there is a war in my country.
Sorry!"

This probably explains why this addon isn't working anymore. Some recent changes in the the URL's for the weather services his addon links to are the likely reason for the disruption. And this assumes he's still alive.

Personally, I'll look for an alternative for a while, but I won't uninstall it. I wish him and his fellow countrymen and women well.