Examine source code of Jekyll

{
  "name": "Jekyll",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Jekyll Island.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(222, 93, 218, 1)",
      "bookmark_text": "rgba(54, 194, 187, 1)",
      "toolbar_field_text": "rgba(55, 232, 73, 1)",
      "tab_line": "rgba(168, 55, 55, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81b912a8-695b-4ad5-acbb-25f1aab4eed9}"
    }
  }
}