Examine source code of Wanderer Theme

{
  "name": "Wanderer Theme",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "dark-blue-color-solid-background-1920x1080.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(125, 212, 250, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 227, 178, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9da48c14-7ea3-460c-9748-9c919dcad3f2}"
    }
  }
}