Not all of it. > Of the three layers, only the UI layer is closed-source. This means that roughly 92% of the browser’s code is open-source coming from Chromium

Not all of it. > Of the three layers, only the UI layer is closed-source. This means that roughly 92% of the browser’s code is open-source coming from Chromium, 3% is open-source coming from us and only 5% is our UI closed-source code. https://vivaldi.com/blog/vivaldi-browser-open-source/ https://vivaldi.com/blog/vivaldi-browser-open-source/