I installed it and tested a bit on Mint. Unluckily I had to update Mint from 18.3 to 19 first which took quite a while.
Installing with apt (similar to yum) it did pull in some KDE libs which probably aren't needed but do give some extra functionality like a password manager. It also pulled in gstreamer which is likely used for multimedia, this could be a problem as we don't have a gstreamer port and when I looked at it back when Firefox used it, it did not look trivial to port, it's plugin based so needs to dynamically load DLLs. So Youtube etc may not work at first on OS/2
Has the same minimal (phone?) UI that has become popular for some reason with the hamburger menu and not very configurable.
Doesn't support WebExtensions unluckily and only has half dozen or so extensions. I spent quite a bit of time trying to install the JavaScript blocking extension with no luck. Even being able to block all JavaScript would be better then nothing. No idea about cookies.
The browser itself seemed fine, displayed everything I tried, didn't take much CPU or memory but I didn't test that much. I assume it uses the same JavaScript engine as Chrome so a lot of stuff that doesn't currently work should.
It'll probably make a good secondary browser but the lack of extensions is a problem and things such as passwords will have to be manually transferred.
Have to play with it a bit more but at least it seems to display modern JS heavy sites.