Examine source code of febunesp

{
  "theme": {
    "images": {
      "theme_frame": "feb_paper.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#051cf2"
    }
  },
  "version": "2.0",
  "name": "febunesp",
  "manifest_version": 2
}