Examine source code of Raindrops B

{
  "theme": {
    "images": {
      "theme_frame": "RaindropsBHeadFfoxCust.jpg"
    },
    "colors": {
      "frame": "#e31616",
      "tab_background_text": "#c4b8b8"
    }
  },
  "version": "2.0",
  "name": "Raindrops B",
  "manifest_version": 2,
  "description": "Rounded shapes with striped lines running through them"
}