Firefox 160 arrives with a change for extension developers

A small change in an extension API can break a check even though the browser appears to work normally. Firefox 160 changes the architecture label returned for ARM64 devices.

Firefox 160 was released on November 10. Mozilla’s developer notes flag a change to the runtime.PlatformInfo API used by browser extensions.

On ARM64 platforms, the API now reports the architecture as arm64, replacing the previous aarch64 value. Extension maintainers who branch on that value can check their detection logic against the new release.