Examine source code of Bleu tranquille

{
  "theme": {
    "images": {
      "theme_frame": "Nouveauhaut.png"
    },
    "colors": {
      "frame": "#4a51a3",
      "tab_background_text": "#270e96"
    }
  },
  "version": "2.0",
  "name": "Bleu tranquille",
  "manifest_version": 2,
  "description": "Tartine tranquille"
}