Examine source code of Outlink Highlighter

{
  "manifest_version": 2,
  "name": "Outlink Highlighter",
  "version": "1.0",
  "description": "Calculates the total number of outlinks on a webpage and highlights them in blue.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{89744dd9-5877-4fb0-894a-9b40b8bb0d9e}"
    }
  }
}