vivaldi seems to be just a variant of Chrome and therefore a Google creature.
They do not advertise any safety/security features, although there may be some; scrolling and maybe other aspects depend on a complied list of graphics chips (Chromium 60 code) to include some which are ‘blacklisted’. 1.11 version apparently does not work well on macs.
I think vivaldi is an offshoot of opera. I saw it discussed on another board where people were discussing Google alternatives. Please let me know if I’ve been misled. Thanks.