Dan - I'm using 4.76 on my SuSE 6.4 Linux. I had upgraded from what I had considered a "stable" 4.73 (relative term... meaning that it didn't blow up every hour or so.... heh), and wished I stayed with 4.73.
I've been avoiding 6 because I've heard mixed things about it. I had one of the early releases of Mozilla (M14 I think), which wasn't half bad, although obviously still not finished. I'm debating giving Opera a shot.
Thing is with NS, coming here to this forum for instance, is a nightmare when the post count in a thread is significant. NS insists on loading every g-d post before finally letting me scroll down to see them. Similarly going to a site like Planetunreal.com, where again, it MUST have everything downloaded into cache before it will display... Putzing with NS's cache settings (both RAM and hard drive) made no difference. Really dumb. 🙁