There's is not final download it's a streaming game. It's live multiplayer. The initial bundle is 12kb (datastar + initial html + css). What you are seeing is

There's is not final download it's a streaming game. It's live multiplayer. The initial bundle is 12kb (datastar + initial html + css). What you are seeing is the constant SSE connection streaming compressed data. Are you behind a corporate proxy? Also what version of firefox? Because it's working fine on firefox for me?