Examine source code of Talavera

{
  "name": "Talavera",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "talavera 200x2000.png"
    },
    "colors": {
      "frame": "rgba(3, 153, 247, 1)",
      "tab_background_text": "rgba(245, 164, 240, 1)",
      "toolbar": "rgba(0, 80, 184, 0.88)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(14, 134, 232, 0.78)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(107, 45, 117, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f3573933-62ba-438b-8ea1-d2d29eb214c0}"
    }
  }
}