Examine source code of Custom Shortcuts

{
  "manifest_version": 3,
  "name": "Custom Shortcuts",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f06a7b2-26d3-4b96-b0f1-75d09b6c819a}"
    }
  },
  "description": "Create custom keyboard shortcuts for various browser actions",
  "permissions": [
    "storage",
    "tabs",
    "scripting",
    "search",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "utils.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Custom Shortcuts",
    "default_icon": {
      "16": "icons/icon-16.ico",
      "32": "icons/icon-32.ico",
      "48": "icons/icon-48.ico",
      "128": "icons/icon-128.ico"
    }
  },
  "icons": {
    "16": "icons/icon-16.ico",
    "32": "icons/icon-32.ico",
    "48": "icons/icon-48.ico",
    "128": "icons/icon-128.ico"
  }
}