Chrome extensions do not automatically allow wasm execution. This must be specified in a CSP directive in the manifest.
Ref https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
The wasm-unsafe-eval directive, while scary looking, "Allows the loading and execution of WebAssembly modules without the need to also allow unsafe JavaScript execution"
The web assembly is a bit of a black box -- however we are building it from a trusted source.