Examine source code of Silver Swirly

{
  "theme": {
    "images": {
      "theme_frame": "SilverSwirly_Header.jpg"
    },
    "colors": {
      "frame": "#0e121a",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Silver Swirly",
  "manifest_version": 2,
  "description": "A simple decorative style for the personal appearance of your favorite browsers. Have fun!"
}