Recs.
Updated
Vivaldi is a Chromium based browser with its UI written with web technologies (HTML/JS). Vivaldi advertises itself as a "power-user browser" as it tries to bring features built-in reducing the number of extensions needed.
Vivaldi was founded by Jón S. von Tetzchner, creator of Opera browser and its CEO until before the switch to Chromium.
SpecsUpdate
Pros
Cons
Con Same security vulnerabilities as Chrome
Vivaldi uses the same browser engine as Chrome, meaning it has the same security-vulnerabilities as Chrome. Chrome is a big target for hackers (being the most popular browser in the world), and a vulnerability for Chrome will likely also exist in Vivaldi.
Con No automatic silent background updates, except on macOS
Unlike most modern browsers, Vivaldi doesn't have the option to update silently in the background. It gives you a dialog box when an update comes out. The box doesn't warn you that not updating the browser could expose you to security risks, which could be pretty bad for your average joe, who doesn't know computers that well.
Con Some non-optional telemetry
According to its privacy policy, Vivaldi sends an approximate location (country or major city), randomized ID, version, cpu architecture, screen resolution (to know what screen sizes to test on) and time since last message every 24 hours (to know amount of active users).