Examine source code of Betwixt

{
  "theme": {
    "images": {
      "theme_frame": "colors.png"
    },
    "colors": {
      "frame": "#2b2b2b",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Betwixt",
  "manifest_version": 2,
  "description": "I'm using this to kind of measure how much of the header image is actually used."
}