https://vivaldi.com/privacy/browser/

When you install Vivaldi browser (“Vivaldi”), each installation profile is assigned a unique user ID that is stored
on your computer. Vivaldi will send a message using HTTPS directly to our servers located in Iceland every
24 hours containing this ID, version, cpu architecture, screen resolution and time since last message.
We anonymize the IP address of Vivaldi users by removing the last octet of the IP address from your Vivaldi
client then we store the resolved approximate location after using a local geoip lookup. The purpose of this
collection is to determine the total number of active users and their geographical distribution.


Chromeみたいに個別ID振って情報収集してるんか・・・・