Examine source code of Rusty Rat

{
  "name": "Apfelsine",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "eye-2.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(196, 196, 196, 1)",
      "toolbar": "rgba(143, 69, 23, 0.5)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(84, 22, 0, 0.57)",
      "toolbar_field_text": "rgba(209, 156, 90, 1)",
      "tab_line": "rgba(153, 105, 37, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07cd73b3-7653-40e0-9246-64a2b028bdd7}"
    }
  }
}