Examine source code of Riverbend2

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#1c2423",
      "tab_background_text": "#bde629"
    }
  },
  "version": "2.0",
  "name": "Riverbend2",
  "manifest_version": 2,
  "description": "A river bend, sliced out of a panorama using IrfanView, Pine River"
}