Examine source code of Venom Band

{
  "theme": {
    "images": {
      "theme_frame": "Header.png"
    },
    "colors": {
      "frame": "#21db04",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Venom Band",
  "manifest_version": 2,
  "description": "well, this was my fist try, so dont be mad if it does not look as good as I want it to be :)"
}