Examine source code of Minimal Silver

{
  "name": "Minimal Silver",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Wear Your Heart(1).png"
    },
    "colors": {
      "toolbar": "rgba(143, 140, 140, 0.5)",
      "toolbar_field": "rgba(255, 247, 247, 0.64)",
      "toolbar_field_text": "rgba(89, 84, 84, 1)",
      "frame": "rgba(171, 171, 171, 1)",
      "tab_background_text": "rgba(107, 107, 107, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)"
    }
  }
}