Resolved, but only through lots of Firefox profile hacking (and I ended up making a new profile after all when I realized my current many-years-old one was >5GB).

BUT!

While doing so I managed to break Windy in a new profile in one step -- by adding the following in Firefox's about:config, which enables the P3 color gamut:

user_pref("gfx.color_management.display_profile", "/System/Library/ColorSync/Profiles/Display P3.icc");
user_pref("gfx.color_management.mode", 1);
user_pref("gfx.color_management.native_srgb", false);

I'm not going to do any more troubleshooting on this, and I don't know why that breaks Windy, but that was the culprit.

Resolved, but only through lots of Firefox profile hacking (and I ended up making a new profile after all when I realized my current many-years-old one was >5GB).

BUT!

While doing so I managed to break Windy in a new profile in one step -- by adding the following in Firefox's about:config, which enables the P3 color gamut:

user_pref("gfx.color_management.display_profile", "/System/Library/ColorSync/Profiles/Display P3.icc");
user_pref("gfx.color_management.mode", 1);
user_pref("gfx.color_management.native_srgb", false);

I'm not going to do any more troubleshooting on this, and I don't know why that breaks Windy, but that was the culprit.

crossing fingers and bumping this -- I have no idea what's gone wrong but I would love to be able to use Windy again!

I've found more problems (again, just this browser and profile).

Everything in the "Rain/Snow" category is empty.

"Temperature" is corrupted:

As is "Waves":

But everything in "Clouds/Aviation" works fine.

As of earlier today, my wind numbers are wrong in Firefox. It is only this Firefox profile - a new profile works fine.

Things I have tried:

• Chrome - works fine.
• Another computer - works fine.
• A new Firefox profile on this computer - works fine.
• Private browsing window - still broken.
• This Firefox profile in safe mode (no extensions loaded) - still broken.
• "Clear all site data" in Firefox - still broken.
• "Log out and delete stored data" at windy.com - still broken.

Other features are working fine including wind gusts, it's just the wind numbers that seem wrong. Any idea what's up?