Firefox Adopts zlib-rs: How a Compression Library Exposed an Intel CPU Bug

Firefox's migration to zlib-rs improves gzip compression performance and security, but the integration process exposed a critical Intel Raptor Lake CPU instability. This case demonstrates that even well-tested 'drop-in replacement' libraries can have unexpected hardware-level implications. Mozilla's successful identification and resolution of the CPU bug showcases the value of real-world testing when adopting new technologies at scale.