Number of logical processors is detectable from web content
The number of logical processors is detectable from web content. Currently, this can be done using https://github.com/oftn/core-estimator:
The total number of cores available to the user agent can already be approximated with high accuracy given enough time using the polyfill in the appendix on a system with low to moderate system load.(see: https://wiki.whatwg.org/wiki/NavigatorCores)
But soon this is getting exposed directly: https://bugzilla.mozilla.org/show_bug.cgi?id=1008453
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