Examine source code of Other Vintage

{
  "theme": {
    "images": {
      "theme_frame": "mozilla.jpg"
    },
    "colors": {
      "frame": "#005ba1",
      "tab_background_text": "#7d7d7d"
    }
  },
  "version": "2.0",
  "name": "Other Vintage",
  "manifest_version": 2,
  "description": "vintage b/w"
}