React Error: “SharedArrayBuffer is not defined” in Firefox

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You need to set two response headers for your document:

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

These are new security requirements for using SharedArrayBuffer.

You can check in code if cross origin isolation is enabled:

if (crossOriginIsolated) {
    // SharedArrayBuffer is available
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer

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