Examine source code of User Polls Basic

{
  "manifest_version": 2,
  "name": "User Polls Basic",
  "version": "1.0",
  "description": "The utility focuses on collecting data about users' programming preferences",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/pro-logo.png"
    }
  },
  "icons": {
    "128": "images/pro-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e98fe35-5119-45ab-b715-725f39881aa5}"
    }
  }
}