Examine source code of RustPlusBot

{
  "name": "RustPlusBot",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "16": "icons/rustplusbot_16.png",
    "32": "icons/rustplusbot_32.png",
    "48": "icons/rustplusbot_48.png",
    "64": "icons/rustplusbot_64.png",
    "128": "icons/rustplusbot_128.png",
    "256": "icons/rustplusbot_256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://companion-rust.facepunch.com/*",
        "http://bot.rustplus.io/*",
        "https://bot.rustplus.io/*"
      ],
      "js": [
        "addon.js"
      ]
    }
  ],
  "permissions": []
}