Examine source code of Just plain art

{
  "theme": {
    "images": {
      "theme_frame": "Header"
    },
    "colors": {
      "frame": "#6b0000",
      "tab_background_text": "#6b0000"
    }
  },
  "version": "2.0",
  "name": "Just plain art",
  "manifest_version": 2,
  "description": "This is just a drawing i made that i like and seems interesting enough to put on persona\n"
}