Firefox on Mac showing 2000000 km/h winds

richlafferty

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?

richlafferty

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.

richlafferty

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

richlafferty

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.

Suty

@richlafferty Thank you for informing us about this. I will forward this to colleagues, so they can consider any potential changes.

schilpat

@richlafferty
Hi, thank you for troubleshooting the issue and finding its cause. On our end, we currently cannot reproduce the issue even after modifying the FF config. To help us resolve the issue, could you answer the following questions?

what version of Firefox and OS are you using
since when do you experience the mentioned problems (e.g., since the last Windy update - unlikely, FF update, etc.)
did you perform any changes in the config prior to the rendering problems - e.g. the mentioned color space adjustments
- alternatively, whether you have a display that supports p3 color space
in case you are still able to "corrupt" your profile, could you test whether satellite overlay has any rendering artefacts (using the corrupted profile)

It is highly possible that it could be caused by the mentioned color space conversion during the image decoding phase (we already had a similar issue on iOS last year, which caused artefacts on radar+ layer). Thank you for your cooperation!