@YoSoyFreeman That's because the new Rust-based COSMIC DE is not out yet (no alpha release for now), and the source link on the COSMIC AlternativeTo page points to the old GitHub repository (the JavaScript-based version). I think we'll change the GitHub repo once there's an alpha or beta release, and the language will automatically be updated since we use the GitHub API for this kind of information.
@gutocarvalho I meant in terms of web browsers, not engines. 😉 I've been using Firefox for a long time, but I've recently switched to Floorp, which I find pretty good.