Examine source code of data-qa Highlighter

{
  "manifest_version": 2,
  "name": "data-qa Highlighter",
  "description": "Visualize data-qa´s areas in screen when click extension icon.",
  "version": "2.4",
  "icons": {
    "32": "images/icon_32.png",
    "128": "images/icon_128.png"
  },
  "permissions": [
    "<all_urls>",
    "file:///*/*"
  ],
  "browser_action": {
    "default_icon": "images/icon_32.png",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*/*"
      ],
      "all_frames": true,
      "css": [
        "styles/tab/styles.css"
      ]
    }
  ]
}