Examine source code of Google Weather Extension

{
  "manifest_version": 2,
  "name": "Weather Forecast",
  "short_name": "Forecast",
  "description": "Weather forecast with a single click on the extension icon.",
  "version": "1.2.2",
  "applications": {
    "gecko": {
      "id": "{bde58d6c-fe1a-5571-7776-6c4582ecc73c}"
    }
  },
  "icons": {
    "16": "skin/images/logo16.png",
    "32": "skin/images/logo32.png",
    "48": "skin/images/logo48.png",
    "128": "skin/images/logo128.png"
  },
  "browser_action": {
    "default_title": "Forecast",
    "default_icon": "skin/images/logo16.png",
    "default_popup": "content/popup.html"
  },
  "background": {
    "page": "content/background.html"
  },
  "options_ui": {
    "page": "content/options.html",
    "chrome_style": false,
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://www.s3blog.org/geolocation.html*"
      ],
      "all_frames": true,
      "js": [
        "/content/geolocation.js",
        "/content/utils.js",
        "/content/prefs.js",
        "/content/geolocation_init.js"
      ]
    },
    {
      "js": [
        "/content/common.js",
        "/content/tab_loader.js",
        "/content/model.js",
        "/content/fetcher.js",
        "/content/log.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://embed.windy.com/embed2.html*"
      ],
      "all_frames": true,
      "js": [
        "/content/windy.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "/skin/*",
    "/locale/*"
  ],
  "optional_permissions": [
    "clipboardWrite",
    "downloads"
  ],
  "content_security_policy": "script-src 'self'  'unsafe-eval'; object-src 'self';",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ]
}