Examine source code of B2ST - Mastermind

{
  "theme": {
    "images": {
      "theme_frame": "Header.png"
    },
    "colors": {
      "frame": "#f7f2f2",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "B2ST - Mastermind",
  "manifest_version": 2,
  "description": "B2ST's 3rd Mini-Allbum, \"MASTERMIND\""
}