WebAssembly hard depends on JIT in the browser. Same actually applies to Chrome and such. JIT bugs cause a lot of exploited in the wild vulns so its disabled by default for hardening.

You can toggle JIT off per-site on the top left menu. The site loaded for me after using that.

Microsoft Edge has a JIT-less wasm interpreter they tried upstreaming but Chrome ended up not keeping the work upstreaming so its just an Edge thing.