Examine source code of Calme Blocker

{
  "manifest_version": 3,
  "name": "Calme Blocker",
  "version": "2.1.8",
  "description": "Extension for blocking access to certain websites",
  "permissions": [
    "webNavigation",
    "storage",
    "tabs",
    "alarms",
    "activeTab"
  ],
  "icons": {
    "48": "icons/Icon-MD.png",
    "128": "icons/Icon-LG.png"
  },
  "host_permissions": [
    "<all_urls>",
    "http://localhost:3000/*",
    "http://localhost:5173/*",
    "https://use.appcalme.com/*"
  ],
  "background": {
    "scripts": [
      "config.js",
      "service_worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "http://localhost/*",
        "https://localhost/*",
        "http://127.0.0.1/*",
        "https://127.0.0.1/*",
        "http://0.0.0.0/*",
        "https://0.0.0.0/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "config.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "calme-blocker@appcalme.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}