Examine source code of To Alias

{
  "manifest_version": 2,
  "name": "To Alias",
  "short_name": "to",
  "version": "1.0",
  "author": "Thomas McDonald",
  "developer": {
    "name": "Thomas McDonald",
    "url": "http://tmcd.me"
  },
  "homepage_url": "https://github.com/tmcdo1/to-extension",
  "description": "Adds to/ aliasing to browser. Access aliases hosted worldwide at to/ and make your own or use other's aliases",
  "background": {
    "scripts": [
      "to-listener.js"
    ]
  },
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon-96.png"
  }
}