Hello.

My computer doesn't have a public Internet
I use a browser on a private network.

That's why I need to get an offline file.

Is there any way I can get the file in url below?
Like *.oex *.nex

https://addons.opera.com/ko/extensions/details/install-chrome-extensions/

Thank you.

If you use a keyboard, how about this?
Ctrl + w closes the tab.
Ctrl + shift + w closes the browser.