I am currently using Librewolf.

But Zen & floorp browser looks beautiful.

What do you suggest?

I personally like the looks of Zen.

I would also appreciate any tips to make Zen more secure than it already is.

Edit: consider this too

Negative post about zen: https://www.reddit.com/r/LibreWolf/comments/1ezumu7/comment/ljnjx2b/

Positive post about zen: https://www.reddit.com/r/browsers/comments/1fz7j9s/comment/lqzklza/