Examine source code of Wabubble

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "browser_specific_settings": {
    "gecko": {
      "id": "wabubble@jofoxx.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "default_locale": "es",
  "version": "1.3.2",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://web.whatsapp.com/*",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "32": "icons/icon.svg",
      "48": "icons/icon.svg",
      "128": "icons/icon.svg"
    },
    "default_title": "__MSG_actionTitle__"
  },
  "icons": {
    "32": "icons/icon.svg",
    "48": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "commands": {
    "toggle-whatsapp": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "__MSG_commandDescription__"
    },
    "toggle-censor": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "__MSG_commandCensorDescription__"
    },
    "toggle-mute": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "__MSG_commandMuteDescription__"
    },
    "reset-bubble": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "__MSG_commandResetDescription__"
    },
    "reload-whatsapp": {
      "suggested_key": {
        "default": "Ctrl+Alt+W"
      },
      "description": "__MSG_commandReloadDescription__"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "whatsapp-content.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "exclude_matches": [
        "https://web.whatsapp.com/*",
        "https://*.whatsapp.com/*"
      ],
      "js": [
        "bubble-content.js"
      ],
      "run_at": "document_end"
    }
  ]
}