Examine source code of Endless 78

{
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "description": "A new take on Snake, now an endless runner!",
  "manifest_version": 2,
  "name": "Endless Snake",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{837cf332-4a86-4653-8fe2-e5224894e6a5}"
    }
  }
}