Examine source code of Cloudy Mars

{
  "theme": {
    "images": {
      "theme_frame": "persona_mars_header.jpg"
    },
    "colors": {
      "frame": "#5e3d38",
      "tab_background_text": "#ffd3b8"
    }
  },
  "version": "2.0",
  "name": "Cloudy Mars",
  "manifest_version": 2,
  "description": "Does Mars even have clouds?!\nMaybe not yet."
}