Examine source code of Clean Links

{
  "manifest_version": 2,
  "name": "Clean Links",
  "version": "2.1.0",
  "description": "Removes tracking junk from URLs",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "cleaner.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cleanlinks@tatsumioga.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}