Actually reading the article, it seems like Kagi are dropping support for Linux builds but also making it open source. Could be big if they follow through on this.

As a KDE Plasma user however, I'd prefer the upcoming Ladybird Browser as it's likely to follow my system theme.

What do you mean by following the system theme? Don't current mainstream browsers like Firefox and Chromium follow the system theme?

What they obviously mean is that as Orion was being built on GTK it didn’t and wouldn’t have followed Plasma theming. And what they also obviously means is that they welcome the upcoming Ladybird as a new browser engine option as it will support KDE Plasma theming.

MacStache got it right, I was writing a long reply about Firefox but then I re-read the comment and remembered that I didn't even mention Firefox. 😅

However, I find that even if Firefox isn't a QT browser, it does a pretty good job of following colour schemes and only messes up on a handful of colour schemes. And turning on system titlebar works around the CSD so that's fine too. The one place it trips up on is following the icon pack, but that's just nitpicking at that point.

I know nothing of how Chromium looks/works these days, it's been like 6 years since I experimented with Vivaldi.

Yeah, it'd be nice to have a modern browser on QT which hopefully means I can try Plasma theming tricks like transparency and force blur on it. Technically this can be done on Firefox with CSS but system titlebar breaks that for some reason.