Examine source code of BG-Berke2

{
  "name": "BG-Berke2",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "BG-Berke2.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(127, 127, 127, 1)",
      "toolbar": "rgba(31, 31, 31, 1)",
      "bookmark_text": "rgba(63, 127, 255, 1)",
      "toolbar_field": "rgba(63, 15, 31, 0.9)",
      "toolbar_field_text": "rgba(63, 255, 31, 1)",
      "tab_line": "rgba(255, 63, 255, 1)"
    }
  }
}