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A comment on Facebook confirms that it tracks mouse movements. Parent comment
There is one : https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibi...
Although I think it can be a privacy concern and somewhat of an anti-feature. For instance, Youtube uses that API to stop playback on mobile when the page or browser is not in the foreground. Of course, there's an extension for that ...
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There is one : https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibi...
Although I think it can be a privacy concern and somewhat of an anti-feature. For instance, Youtube uses that API to stop playback on mobile when the page or browser is not in the foreground. Of course, there's an extension for that ...