Examine source code of Mystical Meeting

{
  "name": "Mystical Meeting",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Mystical Meeting.png"
    },
    "colors": {
      "frame": "rgba(148, 165, 177, 1)",
      "tab_background_text": "rgba(164, 140, 247, 1)",
      "toolbar": "rgba(217, 246, 255, 0.58)",
      "bookmark_text": "rgba(44, 69, 92, 1)",
      "toolbar_field": "rgba(217, 246, 255, 0.34)",
      "toolbar_field_text": "rgba(50, 103, 138, 1)",
      "tab_line": "rgba(74, 156, 204, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{76ec3f4f-28fc-427c-bb2d-0d8669061c77}"
    }
  }
}