Examine source code of Icinga Multi Status

{
  "manifest_version": 3,
  "name": "Icinga Multi Status",
  "short_name": "Icinga Multi Status",
  "version": "1.0.7",
  "description": "Icinga Multi Status helps you monitor your Icinga instances with alert badges and notifications about incidents.",
  "author": "Daniel Schmitz, bashgeek.net",
  "browser_specific_settings": {
    "gecko": {
      "id": "{206cd281-e06c-4cba-97fd-ef24aec41091}",
      "strict_min_version": "58.0"
    }
  },
  "background": {
    "scripts": [
      "inc/icinga.js",
      "inc/data.js",
      "inc/background.js",
      "inc/background_script.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "img/icon_black_16.png",
    "32": "img/icon_black_32.png",
    "64": "img/icon_black_64.png",
    "128": "img/icon_black_128.png",
    "256": "img/icon_black_256.png",
    "512": "img/icon_black_512.png"
  },
  "action": {
    "default_icon": {
      "16": "img/icon_black_16.png",
      "32": "img/icon_black_32.png",
      "64": "img/icon_black_64.png",
      "128": "img/icon_black_128.png",
      "256": "img/icon_black_256.png",
      "512": "img/icon_black_512.png"
    },
    "theme_icons": [
      {
        "light": "img/icon_white_16.png",
        "dark": "img/icon_black_16.png",
        "size": 16
      },
      {
        "light": "img/icon_white_32.png",
        "dark": "img/icon_black_32.png",
        "size": 32
      },
      {
        "light": "img/icon_white_64.png",
        "dark": "img/icon_black_64.png",
        "size": 64
      },
      {
        "light": "img/icon_white_128.png",
        "dark": "img/icon_black_128.png",
        "size": 128
      },
      {
        "light": "img/icon_white_256.png",
        "dark": "img/icon_black_256.png",
        "size": 256
      },
      {
        "light": "img/icon_white_512.png",
        "dark": "img/icon_black_512.png",
        "size": 512
      }
    ],
    "default_title": "Icinga Multi Status",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "notifications",
    "unlimitedStorage",
    "alarms"
  ],
  "host_permissions": [
    "http://*/",
    "https://*/"
  ]
}