Examine source code of seaofbells

{
  "theme": {
    "images": {
      "theme_frame": "bluebells.jpg"
    },
    "colors": {
      "frame": "#356499",
      "tab_background_text": "#092a6e"
    }
  },
  "version": "2.0",
  "name": "seaofbells",
  "manifest_version": 2,
  "description": "small blue bells"
}