Examine source code of Batch Image Downloader

{
  "background": {
    "scripts": [
      "serviceWorker.js"
    ]
  },
  "action": {
    "default_title": "__MSG_appName__",
    "default_icon": "icon-64.png"
  },
  "sidebar_action": {
    "default_title": "__MSG_appName__",
    "default_panel": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "lib/jquery-3.4.1.min.js",
        "lib/arrive.min.js",
        "img_count.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "64": "icon-64.png"
  },
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "permissions": [
    "storage",
    "tabs",
    "downloads",
    "webRequest",
    "declarativeNetRequest"
  ],
  "version": "1.10",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c8fc8bc-3173-4a7e-8530-b052f0f3df75}",
      "strict_min_version": "109.0"
    }
  }
}