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LibreWolf

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

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

Iceraven on Android; it’s got extensions I use – notably SingleFile — that the main Firefox doesn’t have any more.

Firefox containers

Old firefox XUL? When Add-ons isn’t restricted… Well old times… When search toolbar Spyware are everywhere… 😂

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

Nightly

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