Examine source code of Pacific Sunset Gradient

{
  "theme": {
    "images": {
      "theme_frame": "Gradient3-Header.png"
    },
    "colors": {
      "frame": "#333232",
      "tab_background_text": "#9cb4f7"
    }
  },
  "version": "2.0",
  "name": "Pacific Sunset Gradient",
  "manifest_version": 2,
  "description": "A simple gradient that works for your browser. Add some warmth to your winter."
}