Security: Is it the case? (legitimate question) Usability: It works really well for me, even on old computers. Could be better, but in comparison with the other browsers, it does well. Performance: This I don't get, it's snappy, and light for me, feels more solid and less resource hungry than chrome based browsers

Defaults settings are far from being great, but there's no competition in term of privacy, firefox + ublock origin is still the best option.