No. Vivaldi like new Opera is just a skinning project. They made UI slightly better, added some missing functionality (mostry tabs and gestures), but they do not touch core engine.

Case in point fresh Vivaldi on startup makes 4 connections to Google just to say hi, and will keep sending google delicious pieces of data throughout the day, not to mention hardcoded google DNS in case yours is too slow. How about spamming my local network with chromecast UDP garbage? or enumerating shares on startup? WTF would you even do that?

Ps I use Vivaldi :/.