Examine source code of Isar Imker Version 2

{
  "name": "Theme Isar Imker Version 2",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "Theme Isar Imker Version 2 etwas kleiner schmäler.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{843b1f89-ce70-461c-9e03-6433418f23cc}"
    }
  }
}