Examine source code of THE ONE PIECE

{
  "name": "use if you feel like it",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "images (3).jpg"
    },
    "colors": {
      "frame": "rgba(63, 74, 99, 0.77)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(61, 0, 0, 0)",
      "bookmark_text": "rgba(87, 53, 140, 1)",
      "toolbar_field": "rgba(250, 250, 250, 0)",
      "toolbar_field_text": "rgba(69, 78, 138, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{033f6ff3-de89-48e8-9948-042c64f06bdc}"
    }
  }
}