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Interesting. I logged into my gmail with the NixOS build of librewolf and got a windows 10 sign in alert.
It seems it might be an error of wrong detection. Websites parse the user agent string and if the agent doesn't match the default is probably windows. Or it's trying to spoof it.
Try this on the browser console:
window.navigator.userAgent
See what it prints
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"Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0"
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No windows anywhere. It's just the website you're frequenting wrongfully not parsing the string for Linux.
It might be a library they use (unlikely). Or simply bad programming. That's why we need good ones like me :D
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