Examine source code of Aluminum Mint

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e6e6e6",
      "tab_background_text": "#1a3b42"
    }
  },
  "version": "2.0",
  "name": "Aluminum Mint",
  "manifest_version": 2,
  "description": "Simple, elegant aluminum alloy based theme. Add to your browser and click Fav ♡ if you like it. Works great and looks clean! Enjoy"
}