Examine source code of LadyBug

{
  "theme": {
    "images": {
      "theme_frame": "ladybugy_edited-1.jpg"
    },
    "colors": {
      "frame": "#c9f5ee",
      "tab_background_text": "#a6e8a5"
    }
  },
  "version": "2.0",
  "name": "LadyBug",
  "manifest_version": 2,
  "description": "Ladybug!"
}