Examine source code of Summer Bright

{
  "name": "Summer Bright",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "SweetSweetSummerH2Custom.jpg"
    },
    "colors": {
      "frame": "rgba(187, 213, 214, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(188, 212, 214, 0.55)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(188, 212, 214, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(222, 40, 52, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b302fbd3-82ff-4d7d-9a1a-3b676c00e185}"
    }
  }
}