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LibreWolf

The one that always ships late with my distro (Fedora) is my favorite, I guess, since it is the one I use :)

Android. It has the extensions I need and is plenty fast as well.

deleted by creator

Nightly

Firefox containers

For Firefox mobile, it was the Fennec engine where you could easily install any extension… It became a pain with the Fenix engine

The gecko demo that fit on 1 3.5" floppy disk.