Examine source code of Friendly Dogs Fight

{
  "name": "Friendly Dogs Fight",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(232, 233, 235, 0)",
      "tab_background_text": "rgba(255, 255, 143, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 143, 1)",
      "toolbar_field": "rgba(3, 3, 3, 0)",
      "toolbar_field_text": "rgba(255, 255, 143, 1)",
      "tab_line": "rgba(217, 219, 168, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{236130de-eb66-4fbf-80e6-0608b38fc189}"
    }
  }
}