Why does the Yandex icon appear on all sites in the browser?

Question

Browsers

On all sites, the Yandex icon appears in the upper right corner. If you remove the title tag from the page, the icon does not appear. There are no extensions in the browser, there are no viruses, either.
The icon id is WebNotifierMenuLogo, styles are additionally written in the head.
Where did it come from and how to remove it?

Answer 1

Link