Examine source code of Bong - Because Bing is no more

{
  "manifest_version": 2,
  "name": "Bong - Because Bing is no more",
  "short_name": "Bong",
  "description": "Redirect all Bing (and therefore Cortana) searches to a search engine of your choice!",
  "version": "4.0.0",
  "permissions": [
    "webNavigation",
    "storage",
    "background",
    "tabs",
    "*://*.bing.com/"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "background": {
    "matches": [
      "*://*.bing.com/search*"
    ],
    "scripts": [
      "/src/background/bootstrap.js"
    ]
  },
  "icons": {
    "32": "/src/images/logo-32.png",
    "64": "/src/images/logo-64.png",
    "128": "/src/images/logo-128.png"
  },
  "browser_action": {
    "default_title": "Bong",
    "default_popup": "/src/options.html"
  },
  "web_accessible_resources": [
    "/src/images/duck.png",
    "/src/images/google.png",
    "/src/images/yahoo.png"
  ]
}