Examine source code of C_Siel

{
  "theme": {
    "images": {
      "theme_frame": "header_c_siel.png"
    },
    "colors": {
      "frame": "#f0ed28",
      "tab_background_text": "#f4f7f7"
    }
  },
  "version": "2.0",
  "name": "C_Siel",
  "manifest_version": 2,
  "description": "An abstract scene from my favorite holiday vacation"
}