Vivaldi pretends to be Chrome: https://vivaldi.com/blog/user-agent-changes/ https://vivaldi.com/blog/user-agent-changes/ Ideally they would be using feature de

Vivaldi pretends to be Chrome: https://vivaldi.com/blog/user-agent-changes/ https://vivaldi.com/blog/user-agent-changes/ Ideally they would be using feature detection to check whether third-party cookies are supported, but I think it's UA sniffing (possibly because this is a slow feature to check through behavior?)