Examine source code of Exploding Leonardo

{
  "name": "Exploding Leonardo",
  "manifest_version": 2,
  "version": "7.0",
  "theme": {
    "images": {
      "theme_frame": "color-splash3.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(134, 194, 163, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(157, 173, 64, 0.66)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(235, 198, 123, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0dfec77a-4a9d-4af6-b603-a70b02535c6a}"
    }
  }
}