Examine source code of Fine Rain on Window

{
  "theme": {
    "images": {
      "theme_frame": "FineRainonWindow_Header.jpg"
    },
    "colors": {
      "frame": "#6f7073",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Fine Rain on Window",
  "manifest_version": 2,
  "description": "Fine rain on a dark window with a blue tinge."
}