If I click on About Cachy, what’s new opens: Browser · GitLab
So I wonder what’s the difference between Cachy Browser and Librewolf?
It has a bunch of patches from librewolf - yes. We include a bunch of more changes from gentoo, and also customized configs and co.
But the “about” and “Cachy” Section is picked by librewolf 
Here you can find, which patches are used from librewolf:
cachy-browser doesn’t open anyway
Opens fine here
tried it on gnome-DE, cinnamon-DE and plasma-DE
– gnome and cinnamon failed…
Launch it from terminal so you can see why it fails.
Working here on Cinnamon-DE.
a reinstall brought the solution
thx
Opens fine here also