Examine source code of Crypto Address Checker

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "crypto-address-checker@allanmerolla.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "name": "Crypto Address Checker",
  "version": "1.0.0",
  "description": "Compare two crypto addresses (or any text) from any webpage via right-click. Persistent side panel / sidebar shows addresses, source URLs, and a live MATCH / NOT MATCH indicator.",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "optional_permissions": [
    "sidePanel"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "side_panel": {
    "default_path": "panel.html"
  },
  "sidebar_action": {
    "default_panel": "panel.html",
    "default_title": "Crypto Address Checker",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  }
}