Examine source code of In the net.

{
  "theme": {
    "images": {
      "theme_frame": "1115-papukirei-kowai.jpg"
    },
    "colors": {
      "frame": "#f7e1e1",
      "tab_background_text": "#f7f7f7"
    }
  },
  "version": "2.0",
  "name": "In the net.",
  "manifest_version": 2,
  "description": "ネットの中で・・・"
}