Examine source code of Gradients Blues

{
  "theme": {
    "images": {
      "theme_frame": "BrowserHeaderGradientsBlues.jpg"
    },
    "colors": {
      "frame": "#fafafa",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Gradients Blues",
  "manifest_version": 2,
  "description": "I created this using different blues and putting gradients on them and then I did a more muted grey on top and made that a gridient for that also."
}