Examine source code of Adorable Miku

{
  "name": "Adorable Miku",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "miku theme.png"
    },
    "colors": {
      "frame": "rgba(203, 220, 235, 1)",
      "tab_background_text": "rgba(47, 94, 117, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(47, 94, 117, 1)",
      "toolbar_field": "rgba(202, 219, 235, 0)",
      "toolbar_field_text": "rgba(47, 94, 117, 1)",
      "tab_line": "rgba(219, 149, 185, 1)"
    }
  }
}