Examine source code of Les Lilas-Black Yellow

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2e2e2e",
      "tab_background_text": "#ffe100"
    }
  },
  "version": "2.0",
  "name": "Les Lilas-Black Yellow",
  "manifest_version": 2,
  "description": "Les Lilas is on the top right corner of Paris (France),\nas you can see in a map and in this symbol (the curve represents the river Seine)"
}