Examine source code of DuckDuckGoify

{
  "manifest_version": 2,
  "name": "DuckDuckGoify",
  "version": "1.3resigned1",
  "description": "Performs a URL redirection directly on web address, on page load.",
  "icons": {
    "48": "icons/horse-48.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "38": "icons/dollor-38.png"
    },
    "default_title": "Horsify"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "duckduckgoify@development"
    }
  }
}