Examine source code of Sakuras Spring

{
  "name": "Sakuras Spring",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "SakurasSpringH.jpg"
    },
    "colors": {
      "frame": "rgba(250, 232, 225, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(250, 232, 225, 0.05)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e3aa036-54a2-41ac-8c81-0025cac60e7c}"
    }
  }
}