Examine source code of Google Logo Replacer

{
  "manifest_version": 2,
  "name": "Google Logo Replacer",
  "version": "1.0",
  "description": "Replaces the Google logo on google.com with a link to another site.",
  "permissions": [
    "tabs",
    "activeTab",
    "https://www.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon-48.png"
  },
  "browser_action": {
    "default_icon": "icon-48.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42b4cead-e905-4bb3-b56d-2636bad08e25}"
    }
  }
}