Firefox continues cracking down on monitoring with cache partitioning

The Firefox logo is broken into 4 bits.

Enlarge / Breaking the browser cache up into separate swimming pools prevents subtle timing probes that permit one website know whether or not you are logged into one other. (credit score: Mozilla / Jim Salter)

Firefox model 85 shall be launched in January 2021, and one in every of its options is elevated person privateness by way of enhancements in client-side storage (cache) partitioning. This has been broadly and incorrectly reported elsewhere as community partitioning, seemingly on account of confusion across the privateness.partition.network_state flag in Firefox, which permits superior customers to allow or disable cache partitioning as desired.

What’s cache partitioning—and why may I need it?

In a nutshell, cache partitioning is the method of conserving separate cache swimming pools for separate web sites, primarily based on the location requesting the assets loaded, relatively than merely on the location offering the assets.

With a standard, globally scoped browser cache, you may see conduct like this:

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