Examine source code of Bike&Babe

{
  "name": "Bike&Babe",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "firefox kopfzeile.png"
    },
    "colors": {
      "frame": "rgba(240, 240, 240, 1)",
      "tab_background_text": "rgba(35, 81, 247, 1)",
      "toolbar": "rgba(38, 38, 38, 1)",
      "bookmark_text": "rgba(49, 108, 245, 1)",
      "toolbar_field": "rgba(194, 27, 27, 1)",
      "toolbar_field_text": "rgba(53, 93, 240, 1)",
      "tab_line": "rgba(247, 8, 8, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54ef8a1e-393b-4f5b-9479-136b4cdf3585}"
    }
  }
}