Examine source code of Rounded Squares

{
  "theme": {
    "images": {
      "theme_frame": "persona.jpg"
    },
    "colors": {
      "frame": "#f70505",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "Rounded Squares",
  "manifest_version": 2,
  "description": "A persona made using paint that depicts a rounded square pattern on a black background. Abstract, art, colour, calm"
}