Very slow load in Firefox – stuck on “Downloading Runtime”. No error in console, and the .wasm file is stuck in the loading stage in the Network tab – a few minutes first time, 20 seconds now (with cache cleared). No such problems in Chromium. Weird!

Overall though it's a cool project. Personally I would prefer if it was a desktop app as well (with better integrations and less overhead – and certainly with hi-res support!). Congrats on the launch!