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Just out of interest I looked at Windy.com on Firefox/Linux and it looks fine? No blue/yellow banding. Wind gusts seem to show up fine. I've also had a look at the other stuff (e.g. waves, clouds, etc) which all seem to work as expected. This is with Firefox 78 LTS. Unless things have regressed in between version 78 to 90, I wonder if there is something else causing your issues?

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So it seems like it was caused by FF blocking HTML5 canvas fingerprinting. Enabling that allowed it all to load correctly. I guess I must've hit disallow without thinking when I first visited, and that response was saved even after clearing cache, so that example at least is probably my fault.

I do wonder if every user would be aware that the 'Allow site to extract canvas data?' popup can break site functionality though -- its not as though there's a warning to that effect in browser.

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