Examine source code of Mount Etna by M♥Donna

{
  "name": "Mount Etna by M♥Donna",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(20, 19, 19, 1)",
      "tab_background_text": "rgba(247, 247, 247, 1)",
      "toolbar": "rgba(20, 19, 19, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(20, 19, 19, 0.11)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(208, 214, 43, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{317a5c84-855e-405b-af76-317628caf639}"
    }
  }
}