Falkon, formerly QupZilla, is a QtWebEngine based cross-platform web browser.
It aims to be a lightweight web browser available through all major platforms.
Falkon has all standard functions you expect from a web browser. It includes bookmarks, history (both also in sidebar) and tabs. Above that, it has by default enabled blocking ads with a built-in AdBlock plugin.
During the Akademy 2017 Konqueror BoF, the ex-maintainer of Konqueror , David Faure, proposed to integrate QupZilla into KDE in order to replace the aging Konqueror. His reasoning is that QupZilla is already much more advanced in terms of webbrowsing features, and there is almost nobody working in Konqueror, so there is no point in duplicating efforts.