Examine source code of Triple Search Engine

{
  "manifest_version": 2,
  "name": "Triple Search Engine",
  "version": "2.5",
  "description": "3 Search Engine.",
  "permissions": [
    "tabs",
    "storage",
    "browserSettings"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "background": {
    "page": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a59eca0c-aaea-4bf1-a2e0-1e717cb2fc39}"
    }
  }
}