Examine source code of Idiom Master Challenge

{
  "manifest_version": 2,
  "name": "Idiom Master Challenge",
  "version": "1.0",
  "description": "Master English idioms with a fun fill-in-the-blank popup game. Guess the missing words of popular expressions to boost your fluency daily.",
  "icons": {
    "48": "idiom_master_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Idiom Master Challenge"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a052f6f-5f15-4e8b-9507-dd71bbaf2e59}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}