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First‑Party Isolation

Network Privacy

Privacy Browser Third‑Party Cookies Cookie Third‑Party Tracking

Keeping each website’s data separate in your browser.

Definition

First‑party isolation is a browser feature that separates cookies and storage by website, making cross‑site tracking harder.

In plain English Keeping each website’s data separate in your browser.

Why this matters

Why it matters: It reduces tracking that depends on shared cookies or storage.

Example

Example: A tracker can’t use the same cookie across two different sites.