Examine source code of oddworld - mudokon faces

{
  "theme": {
    "images": {
      "theme_frame": "firefoxtheme.png"
    },
    "colors": {
      "frame": "#ff1414",
      "tab_background_text": "#cc1a1a"
    }
  },
  "version": "2.0",
  "name": "oddworld - mudokon faces",
  "manifest_version": 2,
  "description": "the oddworld logo, a selection of mudokon face symbols, also an extra face symbol:)"
}