Examine source code of BC16

{
  "name": "BC16",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "rgb.png"
    },
    "colors": {
      "frame": "rgba(34, 45, 50, 1)",
      "tab_background_text": "rgba(191, 189, 187, 1)",
      "toolbar": "rgba(34, 45, 50, 1)",
      "bookmark_text": "rgba(75, 135, 151, 1)",
      "toolbar_field": "rgba(34, 45, 50, 1)",
      "toolbar_field_text": "rgba(75, 135, 151, 1)",
      "tab_line": "rgba(0, 0, 0, 0)"
    }
  }
}