Examine source code of URL Transformer

{
  "manifest_version": 3,
  "name": "URL Transformer",
  "version": "1.3",
  "description": "Transforms URLs to use various proxies to bypass paywalls with one click",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd15671b-c5d0-4ec4-9a41-e5f70b78c06e}"
    }
  }
}