Examine source code of fis

{
  "name": "fis",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "animated-koi-fish.gif"
    },
    "colors": {
      "frame": "rgba(0, 52, 64, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 71, 102, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.7)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 169, 207, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e0563e2-01d3-4a4b-8ffa-8fbc4dab88fd}"
    }
  }
}