Fedora Firefox package built for Gtk3 toolkit. Should run with your recent profile and extensions.
If you see any bugs, please file them at bugzilla.redhat.com under firefox component with [GTK3] in summary.
Some knows issues:
This package replaces the official Fedora Firefox.
The following unofficial repositories are provided as-is by owner of this project. Contact the owner directly for bugs or issues (IE: not bugzilla).