qutebrowser[1], with these settings[2]. It fits my desktop environment perfectly, as I use a tiling window manager and live in the terminal.

I may switch back to Firefox, which is what I use for development, if I ever find the time to customize Firefox to look and feel more like qutebrowser.

[1] https://qutebrowser.org/

[2] https://git.sr.ht/~jamesponddotco/dotfiles/tree/master/item/...