Examine source code of FINAL FANTASY VI - Menu

{
  "name": "FINAL FANTASY VI - Menu",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Final Fantasy VI.png"
    },
    "colors": {
      "frame": "rgba(120, 120, 208, 1)",
      "tab_background_text": "rgba(0, 216, 216, 1)",
      "toolbar": "rgba(120, 120, 208, 1)",
      "bookmark_text": "rgba(248, 248, 248, 1)",
      "toolbar_field": "rgba(248, 248, 248, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(248, 248, 248, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{949b397a-7d7c-4340-af3b-a0e1c00a30a5}"
    }
  }
}