Examine source code of Old Rock Schools

{
  "theme": {
    "images": {
      "theme_frame": "Classic_Rock_Wallpaper_Set_by_Calacruf.jpg"
    },
    "colors": {
      "frame": "#f2eaea",
      "tab_background_text": "#e3e0e0"
    }
  },
  "version": "2.0",
  "name": "Old Rock Schools",
  "manifest_version": 2,
  "description": "old schools of metal music"
}