Keep an eye on the Storage API
The Storage API (https://developer.mozilla.org/en-US/docs/Web/API/Storage_API) is the API that
defines a common, shared storage system to be used by all APIs and technologies that store content-accessible data for individual Web sites. The Storage API gives sites' code the ability to find out how much space they can use, how much they are already using, and even control whether or not they need to be alerted before the user agent disposes of site data in order to make room for other things.
We should think about neutering its fingerprinting/linkability potential. For now it seems it is disabled by dom.storageManager.enabled
set to false
. Moving to ff59-esr.