Examine source code of Still-life "Spider"

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#479c2d",
      "tab_background_text": "#b9ffa8"
    }
  },
  "version": "2.0",
  "name": "Still-life \"Spider\"",
  "manifest_version": 2,
  "description": "Self painted image on my website"
}