Examine source code of Cow Finder

{
  "manifest_version": 2,
  "name": "Cow Finder",
  "version": "2.0",
  "description": "Highlights specific names on web pages.",
  "permissions": [
    "storage",
    "<all_urls>",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/16x16.jpg",
      "32": "icons/32x32.jpg",
      "48": "icons/48x48.jpg",
      "64": "icons/64x64.jpg",
      "128": "icons/128x128.jpg"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{87affabb-128c-4ef8-a640-ffaf2c3e04db}"
    }
  }
}