Examine source code of Sunset Bird

{
  "name": "Sunset Bird",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(240, 234, 197, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.08)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(247, 255, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{889e8221-dbe6-425f-be45-e540882deac1}"
    }
  }
}