Examine source code of UnShortener

{
  "manifest_version": 3,
  "name": "UnShortener",
  "version": "1.0.16.5",
  "description": "UnShortener enhances your experience on navigating through links that are shortened.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@unshortener",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://work.ink/*"
      ],
      "js": [
        "work_ink.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "rules",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  }
}