Examine source code of Viking Escape Fun Basic

{
  "manifest_version": 2,
  "name": "Viking Escape Fun Basic",
  "version": "1.0",
  "description": "Viking Escape is a fun and free game right on your gadget, easy to join and not too difficult to play.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/viking-logo.png"
    }
  },
  "icons": {
    "128": "images/viking-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a86756ee-e0bc-429e-896b-3c306e9aa23e}"
    }
  }
}