Examine source code of Summer Pastel

{
  "name": "Summer Pastel",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "St. Johns.jpg"
    },
    "colors": {
      "frame": "rgba(192, 240, 205, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(242, 245, 206, 1)",
      "bookmark_text": "rgba(204, 130, 130, 1)",
      "toolbar_field_text": "rgba(191, 124, 124, 1)",
      "tab_line": "rgba(194, 167, 167, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56d66a52-547f-4e4b-9d21-bb90fc6330ea}"
    }
  }
}