Tried it for a few days. It works just like firefox minus one embedded video that crashed after 5 secs but worked in ordinary firefox.
What really surprised me was the speed. Loading youtube on firefox ~0.6 on zen ~0.1 which felt rather nice. I’m still not sure if its worth the hassel to switch.
That was my first linux distro I tried, took 12 minutes to boot on my Pentium 75 with 8mb RAM. Still better then win98 though