Examine source code of Cactaculous3

{
  "theme": {
    "images": {
      "theme_frame": "bg3g.png"
    },
    "colors": {
      "frame": "#ae0d11",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Cactaculous3",
  "manifest_version": 2,
  "description": "Sell online with Solid Cactus, your partner in e-commerce success.  Search Marketing, Pay Per Click Marketing, Call Center Services and more - we have everything you need"
}