A person used the following link in a unsolicited files inserted without permission into web hosting accounts including mine, causing websites breakage.

Inserted web page file screenshot:
drive.proton.me /urls/JH6WNJA0SG#r9YXa0eLisG7 (may be soon removed)

The link:
https:// go.linkify.ru / 1uLb

is then linking to:
designhubapp.com /before-you-continue/?clickid=0&utm_source=admaven&utm_term=1179433&campaign_id=AM_1179433

and then to:
addons.mozilla.org /en-US/firefox/addon/designhub/