Examine source code of Volleyball

{
  "name": "1000023237",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1000023237.png"
    },
    "colors": {
      "frame": "rgba(224, 163, 22, 1)",
      "tab_background_text": "rgba(56, 50, 50, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ec41983-611d-4815-862f-c39159c1b6b6}"
    }
  }
}