Examine source code of Fireball

{
  "name": "Fireball",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "fireveins.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(235, 235, 235, 1)",
      "toolbar": "rgba(163, 115, 2, 0.41)",
      "bookmark_text": "rgba(245, 245, 245, 1)",
      "toolbar_field": "rgba(99, 1, 1, 0.78)",
      "toolbar_field_text": "rgba(245, 245, 245, 1)",
      "tab_line": "rgba(255, 253, 153, 0.46)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{80236f74-79a0-4a5c-83c2-b9a0dd7bf846}"
    }
  }
}