Examine source code of Personal_Theme1

{
  "name": "Personal_Theme1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled.png"
    },
    "colors": {
      "frame": "rgba(53, 54, 58, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(60, 62, 67, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(45, 45, 48, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(131, 139, 211, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3af1997c-6339-4654-82da-0d5cb1937b93}"
    }
  }
}