Examine source code of Subtle-dark-trans

{
  "name": "Subtle-dark-trans",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ThisIsNotABackground.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(122, 203, 245, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(234, 172, 184, 1)",
      "toolbar_field": "rgba(15, 15, 15, 1)",
      "toolbar_field_text": "rgba(234, 172, 184, 1)",
      "tab_line": "rgba(122, 203, 245, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4610a018-67d5-457c-9c41-9e9f54e59afc}"
    }
  }
}