Examine source code of Hidden Butterfly

{
  "name": "Hidden Butterfly",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "hidden-butterfly.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(74, 74, 74, 0.82)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(10, 222, 255, 0.46)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 230, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3d5087e4-3bbd-45c5-8a99-b3e8bd927269}"
    }
  }
}