Examine source code of URL Sender Overlay

{
  "manifest_version": 2,
  "name": "URL Sender Overlay",
  "version": "1.0.1",
  "description": "Send the current page URL to the OneSmartSite server or another tab.",
  "permissions": [
    "cookies",
    "tabs",
    "https://onesmartsite.com/*",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "libs/jquery.min.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c0023da-ae27-4558-9bb0-20a470018326}"
    }
  }
}