Examine source code of Anniversary

{
  "name": "Anniversary",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "flower-18.png"
    },
    "colors": {
      "frame": "rgba(181, 181, 181, 1)",
      "tab_background_text": "rgba(3, 3, 3, 1)",
      "toolbar": "rgba(217, 217, 217, 0.37)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(204, 204, 204, 0.7)",
      "toolbar_field_text": "rgba(3, 3, 3, 1)",
      "tab_line": "rgba(255, 255, 255, 0.72)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2cb41ec-8249-4e6a-91b7-ecc94eec7e62}"
    }
  }
}