Examine source code of Erecle

{
  "manifest_version": 2,
  "name": "erecle",
  "description": "Cleans Amazon Kindle URLs by removing excess parameters for a cleaner, more readable and bookmarkable format.",
  "version": "0.0.6",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "activeTab",
    "*://*.amazon.com/*",
    "*://*.amazon.co.uk/*",
    "*://*.amazon.de/*",
    "*://*.amazon.fr/*",
    "*://*.amazon.it/*",
    "*://*.amazon.es/*",
    "*://*.amazon.ca/*",
    "*://*.amazon.com.br/*",
    "*://*.amazon.in/*",
    "*://*.amazon.co.jp/*",
    "*://*.amazon.com.au/*"
  ],
  "host_permissions_reason": "The extension accesses amazon.com and regional amazon sites to identify and clean Kindle book URLs by removing tracking and session parameters, making the URLs cleaner and more bookmarkable.",
  "reason_for_remote_code": "This extension does not use remote code execution. All functionality is contained within local scripts.",
  "browser_specific_settings": {
    "gecko": {
      "id": "wxt-erecle@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "ERECLE",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.ca/*",
        "*://*.amazon.co.jp/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.com.au/*",
        "*://*.amazon.com.br/*",
        "*://*.amazon.com/*",
        "*://*.amazon.de/*",
        "*://*.amazon.es/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.in/*",
        "*://*.amazon.it/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}