hostdit/minecraft-server-in-firefox ? reverse-engineered prompt

Build me a funny little project that turns Firefox into a Minecraft 1.8.9 server, so I can open the browser, run one script in the Browser Toolbox, and have clients connect to localhost on port 25565. I want the browser itself to act like the server, with a simple live map tab that refreshes on its own, plus start, stop, and clear controls that work from that page.

It should support the basics only, like server list ping, offline login, creative mode, keep alive messages, chat, a flat world, and a tab for each player when they join. I do not need mobs, inventory saving, physics, or world saving. Make it work on recent Firefox with as little setup as possible, and if you need to check any current Firefox docs or APIs while building it, go ahead and look them up online.