Examine source code of Google MyLogo

{
  "manifest_version": 2,
  "name": "Google MyLogo",
  "version": "2.2.3",
  "description": "Change Google Logo into Your Name!",
  "author": "Gamitisa",
  "developer": {
    "name": "Gamitisa",
    "url": "https://gamitisa.com"
  },
  "homepage_url": "https://gamitisa.com",
  "icons": {
    "16": "icons/icon16.png",
    "24": "icons/icon24.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "page_action": {
    "default_title": "Google MyLogo",
    "default_icon": {
      "19": "icons/icon19.png",
      "38": "icons/icon38.png"
    },
    "default_popup": "popup.html",
    "show_matches": [
      "https://www.google.com/",
      "https://www.google.com/?*",
      "https://www.google.com/search*",
      "https://www.google.com/webhp*"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/",
        "https://www.google.com/?*",
        "https://www.google.com/search*",
        "https://www.google.com/webhp*"
      ],
      "js": [
        "mylogo.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "permissions": [
    "storage",
    "activeTab"
  ]
}