Examine source code of Customizable New Tab

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.7",
  "description": "__MSG_extensionDescription__",
  "author": "__MSG_extensionAuthor__",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "56.0"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "chrome_url_overrides": {
    "newtab": "page/index.html"
  },
  "permissions": [
    "*://*/*",
    "storage",
    "unlimitedStorage",
    "menus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "./lib/color-thief/dist/color-thief.umd.js",
      "mechanism.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "page.js"
      ]
    }
  ],
  "default_locale": "en"
}