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Honestly, Konsole is fantastic. On Gnome I use Blackbox, on Sway I use Foot, but if you’re on KDE you don’t really get better than Konsole.
Alacritty and Kitty are both terminals I used to use back when I was on i3wm, they’re perfectly usable, but I don’t think the average user will gain any tangible benefit from replacing Konsole.
I think Firefox will support both v2 and v3 extensions, so devs can use whichever makes more sense for their project. It has been a while since I looked into it though.