Examine source code of Minecraft (title)

{
  "name": "Minecraft",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "images.jpg"
    },
    "colors": {
      "frame": "rgba(81, 224, 95, 1)",
      "tab_background_text": "rgba(0, 0, 0, 0.82)",
      "toolbar": "rgba(245, 245, 245, 0.94)",
      "bookmark_text": "rgba(0, 200, 222, 1)",
      "toolbar_field": "rgba(3, 3, 3, 1)",
      "toolbar_field_text": "rgba(29, 173, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{70d253f5-9f06-4744-833b-dbe1d5673859}"
    }
  }
}