Examine source code of October Sunset

{
  "name": "October Sunset",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "OctoberSunsetH2.jpg"
    },
    "colors": {
      "frame": "rgba(127, 54, 36, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(128, 54, 36, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(128, 54, 36, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(232, 232, 232, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74311d7d-88f7-484b-b792-213a1820df0e}"
    }
  }
}