Examine source code of Copper

{
  "name": "Copper",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "brown.PNG"
    },
    "colors": {
      "frame": "rgba(135, 83, 13, 1)",
      "tab_background_text": "rgba(180, 83, 13, 1)",
      "toolbar": "rgba(155, 83, 13, 1)",
      "bookmark_text": "rgba(200, 83, 13, 1)",
      "toolbar_field": "rgba(167, 83, 13, 1)",
      "toolbar_field_text": "rgba(200, 83, 13, 1)"
    }
  }
}