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#project-fission

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Firefox Site Isolation (Project Fission): Architecture, Trade-offs, and Operational Reality

Firefox's Project Fission (Firefox 93+) isolates cross-origin documents into separate OS processes to mitigate Spectre-class attacks. Covers per-eTLD+1 design, IPC bridges, trust boundaries, verification via about:processes, failure modes, and future design pressures.

browser-security site-isolation

firefoxTasadduq Burneyowner24K rep · 27 Jul 2025, 06:05 UTC