Examine source code of Cool Animated remake

{
  "name": "cool theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wallpapersden.com_windows-10-clean-dark_1366x768.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(179, 0, 0, 1)",
      "toolbar": "rgba(31, 31, 31, 1)",
      "bookmark_text": "rgba(0, 166, 255, 1)",
      "toolbar_field": "rgba(23, 23, 23, 1)",
      "toolbar_field_text": "rgba(0, 199, 13, 1)",
      "tab_line": "rgba(0, 53, 245, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c3802df-85ec-48ce-87a4-1806f2da3e8c}"
    }
  }
}