Examine source code of xdebug extension

{
  "manifest_version": 3,
  "name": "xdebug extension",
  "version": "1.0.2",
  "description": "A modern, dependency-free, extension for Xdebug",
  "author": "fraser.chapman@gmail.com",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "16": "img/disable16.png",
    "32": "img/disable32.png",
    "128": "img/disable128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "commands": {
    "run-toggle-debug": {
      "suggested_key": {
        "default": "Alt+C",
        "mac": "Alt+C"
      },
      "description": "Toggle debugging"
    },
    "run-toggle-profile": {
      "suggested_key": {
        "default": "Alt+V",
        "mac": "Alt+V"
      },
      "description": "Toggle profiling"
    },
    "run-toggle-trace": {
      "suggested_key": {
        "default": "Alt+B",
        "mac": "Alt+B"
      },
      "description": "Toggle tracing"
    },
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+X",
        "mac": "Alt+X"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "xdebug-extension@fraser"
    }
  }
}