Browser extensions for application sites

Question

Browsers

Are there any browser extensions that allow you to display your page.
For example like this:

Only instead of textarea some site, for example ya.ru

Answer 1

If I understand you correctly.
Saw down the simplest extension and shove an iframe inside the popup window with the desired address. If you need it fully, you need to use AJAX and proxy all requests, or completely write a separate “site” for this extension.

Answer 2

option "settings / tools / create application shortcut" in chrome is that what you need?