This browser can’t run the interactive editor yet

Real Neovim in a tab needs WebAssembly JavaScript Promise Integration (JSPI), which this browser doesn’t enable.

• Chrome / Edge / Chromium 137+ — works out of the box.
• Firefox 152+ — works out of the box.
• Firefox 139–151 — open about:config, set javascript.options.wasm_js_promise_integration to true, then fully restart Firefox (the setting is read at startup).
• Safari — not supported yet.

Proof of life — the engine itself runs fine headlessly: