Examine source code of Bend me a rainbow

{
  "theme": {
    "images": {
      "theme_frame": "Turtle_header.jpg"
    },
    "colors": {
      "frame": "#21211e",
      "tab_background_text": "#fcd8ed"
    }
  },
  "version": "2.0",
  "name": "Bend me a rainbow",
  "manifest_version": 2,
  "description": "Thanks for looking at my work."
}