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Playwright browser contexts give you incognito-grade isolation at near-zero cost. Here's how to use them for fast parallel tests, one-time logins via storageState, and multi-user scenarios — plus where the model breaks down.
Log in once with a Playwright BrowserContext, save storageState, and load a fresh incognito context per test worker to keep auth fast without sharing live state.
Playwright provides the storageState feature to persist authentication cookies and local storage across BrowserContext instances. While this allows for session continuity, it does not encapsulate the browser's disk cache, which remains isolated to the specific context or is cleared upon closure in non-persistent contexts. When using launchPersistentContext ,
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