ANN: not listed here yet
Scammers Website:
https://sŧellar.com/ (https://xn--sellar-ilb.com/)
http://web.archive.org/web/20200730150244/https://xn--sellar-ilb.com/
http://archive.is/cz3TS
Open a new tab
Type about:config and hit enter
Accept the warning if one appears
Search for the string network.IDN_show_punycode
Change the value to true
This will make these domains display as "xn--xxxxx" rather than the site name they are trying to imitate. Chromium based browsers should warn you about punycode domains automatically, provided they are up to date.
Another simple way to avoid falling victim to sites like this which pretend to be other sites, often web wallets and exchanges, is to use a good password manager such as KeePass. KeePass will automatically recognize that it is a fake site and won't input your user name or password.