Is there methods to detect Windows-11 vs Windows-10 in Firefox browser?

Question

Currently,
    On Windows-11 devices I'm getting navigator.userAgent value as Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.134 Safari/537.36 Edg/103.0.1264.77 which is same as Windows-10.

To distinguish between Windows-10 vs Windows-11, I have used User-Agent Client Hints

navigator.userAgentData.getHighEntropyValues(['platformVersion']).then(function(uapv){
    console.log(uapv.platformVersion); 
    var winVer = Number(uapv.platformVersion.split('.')[0]);
    if(winVer>10){
        console.log("It's Win11")
    }else{
        console.log("It's Not Win11");
    }
});

But,
    User-Agent Client Hints are only supported in Chrome/Edge/Opera but not in Firefox.

So, is there a technique/library available to detect Windows-11 in Firefox ?

Answer 1

Yes, Microsoft themselves have given this solution using javascript.

navigator.userAgentData.getHighEntropyValues(["platformVersion"])
.then(ua => {
if (navigator.userAgentData.platform === "Windows") {
const majorPlatformVersion = parseInt(ua.platformVersion.split('.')[0]);
if (majorPlatformVersion >= 13) {
console.log("Windows 11 or later");
}
else if (majorPlatformVersion > 0) {
console.log("Windows 10");
} else { console.log("Before Windows 10");}
} else { console.log("Not running on Windows"); }
});

for reference https://learn.microsoft.com/en-us/microsoft-edge/web-platform/how-to-detect-win11

EDIT: I haven't tested to see if it works on Firefox yet. But from my own experience it works on Brave and Chrome.