Examine source code of Paint a Rainbow

{
  "name": "Paint a Rainbow",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "PaintaRainbowH-Copy3.jpg"
    },
    "colors": {
      "frame": "rgba(152, 182, 224, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(152, 180, 224, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(152, 180, 224, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c33128f-3211-4b58-be07-202f4019837b}"
    }
  }
}