Examine source code of Black Gray Night

{
  "name": "Black Gray Night",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "blackheader.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(212, 212, 212, 1)",
      "toolbar": "rgba(82, 82, 82, 1)",
      "bookmark_text": "rgba(212, 212, 212, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(212, 212, 212, 1)",
      "tab_line": "rgba(50, 175, 184, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d96f676-6e60-4774-bc35-554b104172ba}"
    }
  }
}