Examine source code of Sakura Simplicity

{
  "name": "Sakura Simplicity",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Sakura2Custom.jpg"
    },
    "colors": {
      "frame": "rgba(103, 161, 52, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(100, 163, 52, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(100, 163, 52, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4aba59a3-da6a-4fd4-9945-22f66200c4c5}"
    }
  }
}