Examine source code of NS Rune black

{
  "name": "NS Rune black",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wp10447438-viking-runes-wallpapers.jpg"
    },
    "colors": {
      "frame": "rgba(3, 3, 3, 1)",
      "tab_background_text": "rgba(255, 255, 255, 0.83)",
      "toolbar": "rgba(82, 82, 82, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(217, 217, 217, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2df664a5-168d-4968-8a68-3cdf6629027f}"
    }
  }
}