Examine source code of Know Server Better

{
  "name": "Know Server Better",
  "description": "Show info of server you are connecting to",
  "manifest_version": 2,
  "version": "0.1.1",
  "homepage_url": "https://github.com/garywill/know-server-better",
  "developer": {
    "name": "Garywill",
    "url": "https://github.com/garywill/know-server-better"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}