7 Ways You’re Being Tracked Online (and How to Stop It)
...To save their users’ energy, some browsers allow websites to access the battery state of mobile devices or laptops, without users being aware of it, according to another recent study. Our device batteries’ capacity and usage levels can then be used to track us across websites that incorporate the same piece of code. The scientists’ tests on Firefox and Linux could identify a user who visited two websites within 30 seconds as the same person thanks to the user’s battery status.
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