Examine source code of URL Shortener - surlbe

{
  "manifest_version": 3,
  "name": "surl.be",
  "description": "A browser extension for surl.be, a modern URL shortener",
  "version": "1.0.0",
  "permissions": [
    "tabs",
    "storage",
    "cookies",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.bundle.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "host_permissions": [
    "https://surl.be/*"
  ],
  "optional_permissions": [
    "cookies"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e3d4a5c6-b9f0-42d1-8e5c-3a4b7fdb9a6f}",
      "strict_min_version": "109.0"
    }
  }
}