Examine source code of Extra Blue Bubbles

{
  "theme": {
    "images": {
      "theme_frame": "extrabluebubbles-header.jpg"
    },
    "colors": {
      "frame": "#d5d9ed",
      "tab_background_text": "#1c1b4a"
    }
  },
  "version": "2.0",
  "name": "Extra Blue Bubbles",
  "manifest_version": 2,
  "description": "My first persona... Hope you like it.\nI created the graphics with Inkscape."
}