Examine source code of Blunder13

{
  "theme": {
    "images": {
      "theme_frame": "test2.png"
    },
    "colors": {
      "frame": "#858181",
      "tab_background_text": "#1eabf7"
    }
  },
  "version": "2.0",
  "name": "Blunder13",
  "manifest_version": 2,
  "description": "My first attempt at creating a Persona. I hope you like it x"
}