Examine source code of Rhythmical

{
  "name": "Stripes Version A",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "pattern2025-19-PNG-rix.png"
    },
    "colors": {
      "frame": "rgba(102, 102, 102, 1)",
      "tab_background_text": "rgba(212, 212, 212, 1)",
      "toolbar": "rgba(102, 102, 102, 0.65)",
      "bookmark_text": "rgba(224, 224, 224, 1)",
      "toolbar_field": "rgba(3, 3, 3, 0.46)",
      "toolbar_field_text": "rgba(219, 219, 219, 1)",
      "tab_line": "rgba(176, 176, 176, 0.54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bed839e5-8875-4001-a9af-4ccb477b147f}"
    }
  }
}