OK, so, I lost my password for this forum ๐
Mozilla applications are known to be broken. You'll notice Firefox instantly crashes during my FOSDEM talk. It needs work(tm). I've been using vimb/luakit/midori/netsurf happily, though.
Qt5 applications being broken is a regression. I've just fixed it in pkgsrc. Also here: https://github.com/michaelforney/swc/pull/57
After this I can run qterminal but it doesn't like being closed much. I should fix this. I'd like to use it because it still supports bitmap fonts but sakura doesn't any more.
I consider stability to be an uh, TODO item.