How to add a button with the desired link to the Opera browser?

Question

Browsers

Greetings.
How to add a custom button to the top bar in the Opera browser, namely to this part (in the picture)?

Answer 1

After version 12, this function seems to have disappeared.

Answer 2

The workaround is to write an extension-button - only it will be on the right. For example:
https://addons.opera.com/extensions/details/menubutton/