[pparanoidd]

Would use it 100% if it was open source, such a solvable dealbreaker.

Zen browser is eating their lunch at the moment.

[DavideNL]

Note that Zen Browser is (yet another) Firefox fork. Might as well just use Firefox, with better settings (like Arkenfox user.js, customized how you like it). Would be better security & privacy wise.

Orion is a WebKit based browser (like Safari).