Examine source code of Sapphire Gradient

{
  "theme": {
    "images": {
      "theme_frame": "PersonaHeader.jpg"
    },
    "colors": {
      "frame": "#c4bcbc",
      "tab_background_text": "#f0e8e8"
    }
  },
  "version": "2.0",
  "name": "Sapphire Gradient",
  "manifest_version": 2,
  "description": "Simple persona with simple texture gradient. Blue color gradually becomes darker, which looks beautiful as a persona. The glowing blue color resembles sapphire and hence the persona name - \"Sapphire Gradient\""
}