Examine source code of oldskool metallica

{
  "theme": {
    "images": {
      "theme_frame": "olskolmetallicaheader.jpg"
    },
    "colors": {
      "frame": "#4a8c5f",
      "tab_background_text": "#f5f77b"
    }
  },
  "version": "2.0",
  "name": "oldskool metallica",
  "manifest_version": 2,
  "description": "just how you want it oldskool"
}