[ddevault]

Vivaldi is closed source.

[Mithaldu]

Not entirely: https://vivaldi.com/source/?lang=en

[ddevault]

That's just their chromium patches. You can't build vivaldi from that.

[Fej]

...why? That doesn't make any sense.

[JohnTHaller]

"Competitive advantage" most likely. They built their own HTML-based UI on top of Chromium. So, their browser engine is just Chrome/Chromium/Blink, not something unique. Vivaldi can't even sync your bookmarks between devices yet (at least the last time I checked).