Examine source code of DelayKiller

{
  "action": {
    "default_popup": "popup.html"
  },
  "author": "Sys72Dev <sys72@sys72.com>",
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "commands": {
    "toggle-enabled": {
      "suggested_key": {
        "default": "Alt+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "__MSG_commandToggleDesc__"
    },
    "go-live": {
      "suggested_key": {
        "default": "Alt+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description": "__MSG_commandGoLiveDesc__"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "delaykiller@sys72.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 3,
  "name": "DelayKiller",
  "options_ui": {
    "open_in_tab": true,
    "page": "popup.html"
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "version": "1.1.1",
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "resources": [
        "common.js",
        "inject.js",
        "engine/controller.js"
      ]
    }
  ]
}