Examine source code of Warmth and Sky Gradient

{
  "theme": {
    "images": {
      "theme_frame": "Gradient2-Header.png"
    },
    "colors": {
      "frame": "#575656",
      "tab_background_text": "#15b1e4"
    }
  },
  "version": "2.0",
  "name": "Warmth and Sky Gradient",
  "manifest_version": 2,
  "description": "Gradients that work for your browser.\nBring a warm tropical feeling to your browser without clutter.\n\nEnjoy!"
}