How enabling SharedArrayBuffer for in-browser ffmpeg forced removal of all third-party scripts

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A developer building a browser-based video encoding tool needed SharedArrayBuffer to run ffmpeg compiled to WebAssembly with multithreading support. To enable SharedArrayBuffer, the site required Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers, which enforce strict cross-origin isolation. These headers effectively blocked all third-party scripts, fonts, analytics tools, and embedded iframes because most external resources do not send the required Cross-Origin-Resource-Policy header. As a result, the developer replaced third-party analytics with a custom lightweight solution and self-hosted all assets, eliminating external data sharing entirely. The developer noted that while this trade-off was acceptable for a privacy-focused local tool, it would require significant extra work for sites that genuinely depend on third-party integrations.

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