Examine source code of Silhouette1

{
  "theme": {
    "images": {
      "theme_frame": "Header1.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Silhouette1",
  "manifest_version": 2,
  "description": "My first persona. I couldn't test it as I don't have a little fox in the corner of my browser so I hope it looks ok."
}