They are still working on it. [1]
Personally, Right now I basically resorted to using several profiles but it only supports 1 profile per window so I end up having sometimes 3 windows at the same time. I still switch from time to time to Firefox but it has actually helped me sometimes to keep focus (I.e work).
1. https://orionfeedback.org/d/43-something-like-firefox-multi-...
(And also it's been three months since I used Orion, and development is fast-paced, so things could have changed a lot since then)