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Previously known as QupZilla, Falkon is a free and open-source project, based on the QtWebEngine. QtWebEngine implements some of Chromium's API into Qt, leaving aside unnecessary parts like the auxiliary services which communicate with Google.

The web browser has a built-in ad blocker, which is activated by default, eliminating the need of installing an extension for this purpose. As a result, pages which normally have banners are loaded faster than other web browsers (evidently, which don't possess an integrated and auto-activated ad blocker). Adventurous users can access the ad blocker's configuration settings to create custom rules for blacklisting or whitelisting certain sites.

Falkon is a KDE web browser using QtWebEngine rendering engine, previously known as QupZilla. It aims to be a lightweight web browser available through all major platforms. This project has been originally started only for educational purposes. But from its start, Falkon has grown into a feature-rich browser.

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.

Falkon gives you complete control over the behavior of the address bar and tabs. You can disable JavaScript, customize fonts, use an external download manager if you're not satisfied with the one that's built into the browser, manage saved passwords and HTML5 permissions, allow OSD notifications, and even activate a spellchecker. Extensions can be loaded too (there are several plugins already enabled for autoscrolling, managing personal info, finding images, and others).