Examine source code of Lyonnais.

{
  "theme": {
    "images": {
      "theme_frame": "Wall-OL1dd"
    },
    "colors": {
      "frame": "#e01212",
      "tab_background_text": "#0d3591"
    }
  },
  "version": "2.0",
  "name": "Lyonnais.",
  "manifest_version": 2
}