Examine source code of KuraikoDesu

{
  "name": "KuraikoDesu",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "banneruh.png"
    },
    "colors": {
      "frame": "rgba(210, 224, 251, 1)",
      "tab_background_text": "rgba(41, 30, 51, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8522c3c-b652-40ab-ab72-fc60ca780fca}"
    }
  }
}