Examine source code of Prevent Shortcut Takeover

{
  "manifest_version": 3,
  "name": "Prevent Shortcut Takeover",
  "short_name": "PST",
  "description": "Stop sites from taking over your keyboard shortcuts",
  "icons": {
    "16": "icons/logo.svg",
    "32": "icons/logo.svg"
  },
  "version": "0.6.1",
  "author": "Eric King",
  "homepage_url": "https://github.com/webdeveric/prevent-shortcut-takeover-web-ext",
  "browser_specific_settings": {
    "gecko": {
      "id": "@prevent-shortcut-takeover",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": "icons/action.svg",
    "default_popup": "action.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_start"
    }
  ]
}