Examine source code of Springtime_Test

{
  "theme": {
    "images": {
      "theme_frame": "Spring01.jpg"
    },
    "colors": {
      "frame": "#fff7f7",
      "tab_background_text": "#0b3602"
    }
  },
  "version": "2.0",
  "name": "Springtime_Test",
  "manifest_version": 2,
  "description": "Just a Test and letting springtime come :)"
}