Examine source code of Open in Popup Window

{
  "manifest_version": 3,
  "name": "Open in Popup Window",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "0.6.21",
  "icons": {
    "48": "icon_new.png",
    "96": "icon_new.png",
    "128": "icon_new.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "contextMenus",
    "storage",
    "tabs",
    "contextualIdentities",
    "cookies"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "action": {
    "default_icon": "icon_new.png",
    "theme_icons": [
      {
        "light": "icon_new.png",
        "dark": "icon_new.png",
        "size": 32
      }
    ],
    "default_title": "Open in Popup Window"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "open_in_popup_window@emvaized.dev"
    }
  },
  "commands": {
    "open-popup-in-main-window": {
      "suggested_key": {
        "default": "Alt+Y"
      },
      "description": "__MSG_openPageInMainWindowHotkeyDescription__"
    },
    "open-in-popup-window": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "__MSG_openPageInPopupWindowHotkeyDescription__"
    },
    "open-search-in-popup-window": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "__MSG_openSearchPopupWindowHotkeyDescription__"
    }
  }
}